Cluster 14: forms medically sexually acceptable willing contraception able women use childbearing Cluster 716: condom intercourse drug males father sexually vasectomized stopping taking child Cluster 1074: men wocbp sexually contraception instructed nivolumab azoospermic adhere active women Cluster 1081: sexually males contraception effective childbearing potential use active accepted women Cluster 1960: methods accepted medically sexually contraception fertile male female partners agree Cluster 2303: final contraception method partner sexually effective product childbearing nonsterilized potential Cluster 2433: bear beget children agreement sexually able study contraception dose use