There were a few that were bi, a few gay, and a bunch that were rumored to be gay or bi. My opinion is that every single guy on this site is at least a little bi, otherwise, they probably would not be applying to do gay porn or be able to get off. This list is not exhaustive as I am sure I missed a bunch and others I just don't know about.
Bi:
-Shane IV
-Axe
-Smoke
-Clay
-James Biehn
-Marcus (read a couple of encounters folks had with him on other sites)
-Craig
-Brent
-Vance
-Rod / Rodrigo
-Sesso (he and Kasden said they were 70/30 Bi - leaning a bit more towards women)
-Kasden
-Ken
-Enrique
Gay:
-Peter
-Landon and Bosco
-James (Doug referred to him as his gay friend and James nodded and said yes)
-Bryan (the blond one with the VW tattoo - they referred to him as gay in the foursome video)
-Tony Z
-Tyce
-Cypher
-Matthew
-Riley
-Wyatt
-Jasin
-Scott
-Ethan
-Steve
-Gavin
-Ryken
-Jay (Duh)
-Doug (though now he has found Jesus and has renounced his gayness...in other words, gay)
Haven't Said they were Bi / Gay, but I strongly suspect they are:
-Bentley
-Jackson
-Marc Jr
-Brock
-Taylor
-Ace
-Damion (from site re-launch)
-Tanner (from site re-launch)
-Vince
-Talon
-Nate
-Guzzo
-Lane
-Jebb
-Brick
-Shawn
-Erin
-Snake (took up his ass like a champ and was in ecstasy)
-Alex
-Dicenzio
-Zack
Feel free to correct any I may have gotten wrong or left out