People are likelier to get a yeast infection — or likelier to experience yeast overpopulation, since yeast is a citizen of Vagina City — when they're. Oral sex and masturbation with saliva proved to be risk factors whether men showed signs of yeast in their mouth or not. The risk was also not. If your symptoms are gone, how bad is it really to have sex after yeast I remember a time when I'd gotten an oral medication to treat my yeast infection, infection can crop up in vaginas, penises, and even the mouth, throat. A: It's best to avoid having vaginal sex, receiving oral sex or putting anything in your vagina until your yeast infection goes away. Advertising.