Hepatitis C
Scientists do not know whether Hepatitis C can be transmitted (or spread) through sex. Hepatitis C is more likely in people who have high-risk sexual activity (sexual actions which make them much more likely to get Hepatitis C). However, it is not known whether this is because of these people's sexual behavior, or because these people were also using IV drugs. There does not seem to be any risk that Hepatitis C can be spread through sexual contact between a heterosexual couple (a man and a woman; commonly called a "straight" couple) if neither person has sex with anyone else. There does seem to be a risk of Hepatitis C spreading if one person already has a sexually transmitted infection, like HIV or genital ulceration; or if two people have sex in a way that causes wounds to the lining of the anal canal (like anal penetration - one person putting his penis into another person's anus). The United States government says that most people need to use condoms to protect themselves from getting Hepatitis C only if they have more than one sexual partner.