Articles tagged with Penis
A cohort study of 2771 male children found no evidence that neonatal medical male circumcision is associated with an increased risk of autism spectrum disorder. The study also examined the effects of acetaminophen use during and after the procedure, but found it to be uncommon.
A study published in PLOS Biology found that males rate computer-generated figures with a larger penis as more intimidating and sexually competitive. Women also prefer taller, more V-shaped males with a larger penis, but beyond a certain point, further increases in size have diminishing benefits.
Researchers found cyclin D1 expression in patients with penile cancer (PC) is associated with clinical and histopathological features. Patients with cyclin D1 expression had lower disease-free survival compared to the cyclin D1-negative group.
Researchers at Karolinska Institutet discovered that fibroblasts mediate erection by taking up noradrenaline, widening blood vessels, and increasing the number of cells in response to frequent erections. This knowledge may lead to new treatments for erectile dysfunction.
In a groundbreaking study, researchers observed that serotine bats mate without penetration, using their oversized penises like an extra arm to engage in contact mating. The bats' penises are seven times longer and wider than their partners' vaginas, making penetration impossible.
Researchers developed a new approach to evaluate HIV infection through the entire male genital tract, showing that productive HIV infection occurs in all organs of the male genital tract. Antiretroviral treatment can suppress HIV production and prevent penile HIV infection by using pre-exposure prophylaxis with an antiviral drug.
A study found that healthy adult men with vaginal sex have a unique bacterial community in their urethra, with a core community supporting health and a secondary group more commonly found in the vagina. Vaginal sex has lasting effects, reshaping the male urinary-tract microbiome and increasing bacterial variation.
A study published by the European Association of Urology defines 'growers' and 'showers' as men whose penises increase in size by more than 56% when erect, compared to flaccid states. The researchers found that most men fell into a 'grey zone', with only 24% classified as growers and 25% as showers.
A new study found a direct link between hypospadias and epigenetic alterations, suggesting an environmental cause. Researchers identified a potential biomarker for early detection and better clinical management of the condition.
A team of researchers has developed an artificial tissue that repairs injuries and restores normal erectile function in a pig model. The artificial tunica albuginea (ATA) shows promise for repairing penile injuries in humans by mimicking the microstructure of natural tissues.
Researchers uncovered a unique story behind Marra Wonga rock art site, featuring animal tracks, lines, grooves, and hand-related stencils. The site's composition appears to be linked to the Seven Sisters Dreaming story, with designs spread across the length in a particular order.
Scientists from University of Melbourne and University of Queensland have explained echidna's reproductive enigma, detailing testes that never descend or scrotum. The short-beaked echidna has a remarkable penis with four heads, which are functional in alternating erections.
Researchers have discovered three new species of African vesper bats by comparing their genes, teeth, skulls, echolocation calls, and penis bones. The discovery has resolved taxonomic relationships between the large number of species in the family and describes two new genera.
A 1999 MRI study published in The BMJ found that the penis is shaped like a boomerang during sex, challenging previous assumptions. Additionally, it revealed that the size of the uterus does not increase during female sexual arousal, contrary to previous reports.
Researchers have discovered a unique subset of cells in the developing urethra that send important signals defining how the urethra is formed. This discovery aims to standardize the characterization of hypospadias and improve treatment outcomes for affected children.
Researchers have modified a minimally invasive technique to help men regain erectile function lost after prostate cancer surgery. The 'end-to-side' nerve grafting procedure has shown promising results, restoring erectile function in 71% of patients with significant improvements in quality of life.
Researchers found that androsterone, a steroid hormone produced by the placenta, plays a crucial role in male genital development. The study also suggests that placental dysfunction can lead to disorders of male genital development.
Researchers found that female penises in geographically distinct species of bark lice evolved separately due to environmental pressures and competition for male seminal gifts. The study suggests that the evolution of female penises is linked to sexual selection and mating behaviors.
A major international survey found that around 25% of patients with penile cancer are not receiving recommended treatment. This leads to a significantly lower survival rate, with twice as many patients surviving if treated according to guidelines.
A recent clinical anatomy review sheds light on the discovery of prostate orgasms, discovering that stimulating the prostate via the rectal wall can create exceptionally pleasurable feelings. The study highlights the need to explore this previously ignored area of orgasm research.
A South African team has successfully performed the second penis transplant, a procedure that aims to address penile mutilation caused by traditional circumcisions. The recipient is expected to regain full urinary and reproductive functions within six months, paving the way for cost-effective solutions to help affected men.
A large study found that brachytherapy is a good option for many men with penile cancer, offering high survival rates and minimal impact on sexual and urinary function. The treatment allowed 85% of men to survive with their penis intact, with few cases requiring surgery due to side effects.
A new study by Dara Orbach, PhD, uses computed tomography scans and silicone models to visualize the anatomy of dolphin copulation. The research reveals complex vaginal folds and spirals that interact with the penis during fertilization.
After prostate cancer surgery, patients often experience penile shortening due to anatomical changes. The study found that this change is shortest 10 days post-surgery but recovers to normal values within 12 months.
Scientists found that queen bees infected with deformed wing virus can transmit the disease through natural mating, leading to colony collapse. The study suggests that a significant portion of failed bee colonies is due to queen failure, highlighting the importance of managing queen health.
Kiel researchers found that the stiffness of a male beetle's penis is crucial for successful mating, as the female's spiral-shaped reproductive organ makes penetration difficult. The study suggests that males with softer tips may have an advantage in mating.
Male beetles have evolved to keep their penis tips soft for faster sex, exploiting the female's duct for efficient breeding. Researchers found that a softer tip is better for penetrating the female duct due to its narrow tube, which slows down penetration.
Researchers at ANU tested breeding habits of fish to disprove theory that larger genitals make males more attractive or successful in fathering offspring. They found females don't find bigger genitals more attractive, contradicting previous studies and human research.
A new study published in The Journal of Urology found no differences in penile sensitivity between circumcised and intact men. The researchers also challenged the notion that the foreskin is the most sensitive part of the adult penis. No differences were observed in sexual functioning between the groups.
Differences in anatomy may affect an individual's ability to achieve orgasm, particularly for females where physical characteristics play a significant role. Research suggests that variations in clitoral migration and penis entry angle can influence sexual experiences.
A new study reveals that surgical treatment can effectively restore penile length and improve erectile dysfunction in patients with Peyronie's disease. The 'sliding technique' and penile prosthesis implantation showed promising results, with an average lengthening of 3.2 cm.
Women perceive normal-looking genitals in men with distal hypospadias as comparable to those without the condition. The study aims to alleviate shame or impaired genital perceptions about penile appearance.
Researchers used microscopes to study the structure of Penis Worm teeth, discovering a 'dentist's handbook' for paleontologists. The findings uncovered previously unrecognized species worldwide, shedding light on ancient creatures.
A new study from the University of Cambridge has enabled researchers to identify previously unrecognised fossil specimens by reconstructing the teeth of penis worms in fine detail. The results have aided in the identification of fossilised teeth from a number of species around the world.
A new analysis provides insights into penile size measurements across all ages and races. The findings reveal that the average flaccid penis length is 9.16 cm and the average erect penis length is 13.12 cm, with a small correlation between erect length and height.
Researchers discovered that birds have normally developing penises in early embryos but lose them through a genetic program, suggesting possible benefits for reproductive control. The study highlights the importance of programmed cell death in developmental processes and may provide insights into medical questions.
A study found that circumcision significantly alters the penis microbiome, with a reduced bacterial load and fewer anaerobic bacteria. This change may explain why circumcision offers protection against HIV and other viral infections.
A study by TGen-led researchers found that male circumcision significantly shifts the bacterial community on the penis. The shift is primarily due to a decrease in oxygen-intolerant bacteria, which may help explain why circumcision offers protection against HIV.
A study by Dana-Farber Cancer Institute found that a small percentage of men treated for prostate cancer reported a perceived shortening of their penis, leading to regrets about treatment choice. The complaint was more common in men treated with radical prostatectomy or male hormone-blocking drugs combined with radiation therapy.
A new species of minute freshwater snail, Daphniola eptalophos, has been found in a mountainous spring in central Greece. The species differs from its congeners in shell dimensions, soft body pigmentation and penis coloration.
A recent review by Dr. Rany Shamloul reveals a potential link between cannabis use and negative impacts on male sexual health and performance. Cannabis may have an antagonizing effect on receptors in the penis, making it harder to achieve and maintain erections.
Researchers found that female ducks' vaginas have clockwise spirals to prevent males with aggressive penises from copulating. This evolutionary mechanism helps females control reproduction and provides a unique example of sexual conflict.
Regular cycling can cause genital numbness, erection problems and skin irritations in men. Choosing the right bike is essential to prevent these health issues, including ensuring proper saddle fit, pedal resistance and padding.
A survey of 50 sex therapists found that satisfactory sexual intercourse typically lasts between 3-7 minutes for men and 7-13 minutes for women. The study aims to dispel unrealistic expectations about the length of sexual activity, promoting counseling over medication for addressing existing sexual problems.
A research review found that men worry more about their penis size than women, with average-sized penises being just as desirable. Despite this, many men experience anxiety and small penis syndrome, which can be treated with conservative approaches such as therapy and education.
The campaign, which used humorous cartoon strips to encourage syphilis testing, was associated with an increase in syphilis tests and improved knowledge about the disease. Researchers found that awareness of the campaign led to greater knowledge about syphilis and increased recent testing for the disease.
UCL surgeons successfully performed phalloplasty to rebuild micropennises in nine men, with four able to urinate standing up and four have regular sex. However, complications arose in several cases, highlighting the need for awareness and careful monitoring.
Researchers at Boston Children's Hospital successfully implanted collagen grafts to induce nerve regeneration in rats, promoting partial penile repair. This breakthrough brings the organ closer to complete replacements and paves the way for future tissue-engineered penises.
Hopkins scientists advance understanding of penile erection by showing how blood vessels continuously produce nitric oxide to maintain an erection over time. The discovery offers new insights into the complex physiology of erection and potential applications for treating erectile dysfunction.