Well, when they are wearing a thong that just barely covers their cock and balls, and they are pulling the thong up their ass, they are basically naked.
but you said you seen their assholes. doesnt matter how tight they pull on their trunks thier asshole isnt exposed, but you seen it? how is that possible?

You never pose in the mirror? 
no, im not a bber. im a weight lifter.
im not, starving myself, taking drugs, shaving my body hair, then having some bitch smear tanning and oil on me just to wear underwear in front of a crowd of people in hopes of winning a plastic trophy.
no, i lift to challenge myself to get better each day.