forms medically sexually acceptable willing contraception able women use childbearing 
condom intercourse drug males father sexually vasectomized stopping taking child 
men wocbp sexually contraception instructed nivolumab azoospermic adhere active women 
sexually males contraception effective childbearing potential use active accepted women 
methods accepted medically sexually contraception fertile male female partners agree 
final contraception method partner sexually effective product childbearing nonsterilized potential 
bear beget children agreement sexually able study contraception dose use