Eric and the sex in the toilet scene?

My first impression was that it was a man, but the only identifiable feature was a blue top (either a blue dress pulled up or a blue shirt with pants pulled down). After finishing the movie I went back to the bar scenes and found that the only character dressed in blue was another chick in the bar who appeared briefly dancing on stage before Eric took his turn on the trombone. The perverted chick who tried to pick up Zed was dressed all in black, and none of the gang members was wearing anything near the right color blue. So it was either the dancing girl or an unknown character. As to why Eric was doing it there (in that location or in that scene), my initial reaction was that the scene was intended to verify Eric's homo or bisexuality. After looking back at it I'd say the most likely reason was that the bathroom was the only place he could do it. In any case, Eric was definitely putting out a homoerotic vibe towards Zed. I know many people complain that reviewers force this kind of interpretation into many places it doesn't belong, but you'd have to be blind or irrationally homophobic to deny it's here.

http://www.imdb.com/title/tt0110265/trivia?item=tr1981801