External It is important that you talk openly with your health care provider about any activities that might put you at risk for an STD, including oral sex. Genital or anal warts. Oral sex and HIV transmission. Linking to a non-federal website does not constitute an endorsement by CDC or any of its employees of the sponsors or the information and products presented on the website.
And can another straight guy ethically refuse to give a blow job during a threesome?
Plus: tips for dealing with blow job bestowers, when vaginal sex is a big nothing. Fortunately both hepatitis A and B can be prevented by vaccines. Sexually transmitted diseases in men who have sex with men: An epidemiologic review.