contraception methods oophorectomy hormone ovulation sterilization women case abstinence intrauterine contraception contraceptives intrauterine barrier methods device effective potential oral contraceptive contraceptive device double methods women barrier bearing acceptable use child wocbp contraceptive contraception effective highly pregnancy heterosexually continuously exempt active contraception methods oophorectomy child highly women bearing effective intrauterine appropriate oophorectomy appropriate bearing child considered potential vasomotor spontaneous amenorrhea profile