Future directions in contraception.

Although contraceptive research has markedly decreased in the United States, it has continued in other countries. The emphasis has been on the development of long-acting, noncoitally related contraceptives, including the progestogen-only and progestogen-estrogen vaginal rings. The levonorgestrel-releasing intrauterine device is highly effective and, like other contraceptives, may contribute to a decrease in the incidence of pelvic inflammatory disease. There is a great need for more effective, acceptable barrier contraceptives. The vaginal condom does not appear to be acceptable to many couples. Studies continue to demonstrate couples' lack of adherence to plans for abstinence and poor utilization of the present barrier contraceptives. The potential for the development of a male contraceptive utilizing gonadotrophin hormone-releasing hormone agonists or antagonists in conjunction with testosterone may hold promise in the future.