ITA w/ Bearcata! We shouldn't be surprised if there's a lot of sex going on, hell Julie was even rumored to have hooked up with Jeremy on Inferno I or Sarah and Theo on the Gauntlet I, these are people you'd least expect it from so let alone some of the famewhores here.
Most of these castmembers are perennial libertines anyways! Look at mega famewhore Mark, he's already in his 30's but parties like he's still in his college frat house and starts a showmance w/ Robin for attention! Grow up you old goon! (Note: I do not think people in their 30's are old goons)
Derrick is such a lost cause, its no wonder he and Katie are such good friends, they drink and smoke all the time. I'm surprised they haven't hooked up, or maybe they have, but its never been caught.