TV ads tout testosterone treatments for "low T," but surprising new research shows a different hormone may play a role in less sex drive and more fat as men age. Estrogen -- the female hormone -- is needed by men, too, and the study gives the first clear evidence that too little of it can cause certain "male menopause" symptoms.
Many heart specialists aren't comfortable with discussing sex with their patients. But new guidance says they should, early and often, to let survivors know intimacy is often possible after a heart attack.
There is no need for patients who have developed cancer from an oral HPV infection to refrain from sex with their spouses or long-term partners, according to a study out Saturday.
Autumn is the time of year most associated with bumper crops of new babies, and according to an Israeli study there may be a scientific reason for it: human sperm are generally at their healthiest in winter and early spring.
A man's ability to produce sperm may depend on his ability to handle stress, according to a study from Italy that looked at the impact of short- and longer-term stress.
The road to hell is paved with good intentions, as they say: the more housework married men do, the less sex they have, according to a new study published Wednesday.
It can seem like infertility is on the rise, especially in developed countries as women wait longer to start families. But according to a new analysis of 277 surveys, conducted by researchers at the World Health Organization and other institutions, infertility trends around the world stayed largely the same from 1990 to 2010.
Groundbreaking work with lab mice has boosted hopes for a male contraceptive pill, researchers in the United States reported on Thursday.
Women who choose birth control pills, the patch or vaginal ring are 20 times more likely to have an unplanned pregnancy than those using long-term methods such as IUDs and implants, a study released Wednesday found.
U.S. health authorities on Friday urged all boys age 11-12 to get a routine vaccination against the most common sexually transmitted disease, human papillomavirus, or HPV.