Male contraception.

Although the modern era of contraception has focused attention on the female, research into male contraception is continuing on several fronts. Despite the widespread use of premature withdrawal, the condom and vasectomy, there is no acceptable drug for controlling fertility in the male. New advances have been made in influencing the maturation and fertility capacity of sperm. Techniques are being developed for reversibly blocking sperm transport. The functions of seminal fluid are under intensive investigation.