New research shows that marijuana causes genetic changes in sperm, though it's not clear what effect those changes have, or if they're passed on to a man's children.
A low sperm count may do more than affect a man's ability to have children. It also may be linked to a number of health problems, new research suggests.
The NCAA basketball tournament and other major sporting events are popular times for men to schedule vasectomies, because they have something to watch on TV while they recover.
Men with early stage prostate cancer who have surgery to remove their tumor do not live longer than those who receive no treatment at all, a long-running clinical trial has concluded.
A new gel-based vasectomy has proven effective in a group of monkeys, raising hopes it could one day provide a permanent but easily reversible male contraceptive option in humans.