One of the kids Briscoe and Curtis interviewed said he saw the victim buying codeine from a street dealer, that it is used often as a party drug and a sex drug. However it makes no sense for codeine to be used to enhance a sexual experience. Codeine, like all opiates, actually dampens sexual desire in both men and women, but especially men because it greatly reduces testosterone levels. One of the most common side effects of opiates for both sexes is a decreased sex drive and in men opiates often cause erectile dysfunction.