Regarding the practice of safe sex, which of the following statements is FALSE?

a. Sexually active persons should practice safe sex until their partner's sexual history and/or health has been clearly established.
b. Rates for many STDs are rising among gay men due, in part, to the fact that new medical treatments are helping people with HIV live longer and not look sick.
c. Drinking alcohol has not been shown to increase the likelihood of taking sexual risks.
d. A study of heterosexual adults also found that the majority did not practice safe sex with their last partner.

C