Young gay and bisexual men who use methamphetamine are more likely to take sexual risks that boost their chances of contracting HIV, a new study suggests. Researchers say the findings underscore the fact that meth, and its associated HIV risk, is not just a problem of middle-aged white men. Methamphetamine triggers a massive …

A growing body of evidence suggests that antioxidants may have significant value in addressing infertility issues in both women and men, including erectile dysfunction, and researchers say that large, specific clinical studies are merited to determine how much they could help. A new analysis, published online in the journal P…

Scientists have found a new contributor to male infertility, a protein that is supposed to coat sperm to help them swim to an egg, unless that coating goes missing. About 20 percent of men may harbor gene mutations that leave their sperm coat-free and thus lower their fertility, an international research team reported Wednesd…

In a result that will fundamentally change approaches to HIV prevention in Africa, an international study has demonstrated that individuals at high risk for HIV infection who took a daily tablet containing an HIV medication – either the antiretroviral medication tenofovir or tenofovir in combination with emtricitabine – e…

Circumcision, or the surgical removal of the skin covering the tip of the penis, can be a matter of family tradition, parental preference or religion—but what are the sexual, health and social aspects surrounding this sometimes controversial issue? Although statistics from the Centers for Disease Control and Prevention show…