口交
Oral sex is not necessarily an effective method of preventing sexually transmitted infections (STIs), although some forms of STIs are believed to be less commonly spread in this way, and oral sex has been recommended as a form of safe sex. In the United States, no barrier methods for use during oral sex have been evaluated as effective by the Food and Drug Administration. However, a barrier protection like a condom for fellatio or dental dam for cunnilingus can offer some protection from contact when practicing oral sex.