kinda hard to work his angle of not being gay but loves dancing for them because they tip well... its obviously a bit more than that when the precum is seeping through his thong. I seriously doubt a straight man would be oozing sexual body fluids in that situation..
That isn't a piss stain its pre cum derek is about to blow his load he is so turned-on !
Seriously, how much more disgusting can things get?
Maybe it's just penile self defense?