Um, I think the context to describe why a group of boys would joke or play like that is pretty clear... It's clearly homosexual behavior. You can't do that and not be that, bisexual or at least bicurious.
Remember the Oscar de la Hoya pictures? Remember Dennis Rodman (who marched in a Pride Parade a couple of weeks ago)?
Over 4,700 players have played at least one game in the NBA-- Statistically, a conservative estimate of 6% would yield an estimate of 300 gay or bisexual NBA players in history. Even a crazy low estimate of 2% would be 100. This shouldn't be shocking to anyone.