That's why they play Russian roulette with their behavior, knowing full well that many of their behaviors will kill them. Danger and taboo increase the high and their addiction keeps pushing them to take greater and greater chances.
Some of us have known heterosexual sex addicts.
A friend of mine dated a girl like this. She used to take him down to a high-rise hotel in Atlanta so they could have sex in elevators. He told me he was petrified of getting caught (it would destroy his career) but the sex was like nothing he'd ever known. He ended up marrying the girl.
Weird, huh?
Where was she on the hot-crazy matrix?