crack can really supercharge one's sex drive....in really twisted, stuff that would make a porn star blush kind of ways. crack blows up the pleasure centers in the brain and overrides EVERYTHING else. it's not necessarily a sexual addiction....hookers/escorts are willing participants for the right price and of course many have good connections to dealers and thus they are the total package deal, with no strings attached. just go get your freak on and then "return" to the real world.
i'm so relieved to hear that your tests are clean and he reports that his are as well. probably best to leave this one behind....even if he is now trying to extricate himself from the tangled wreckage, you were an unwilling participant in the insanity.