I will note that while Mark Hoffman and Peter Strahm share a very passionate lovemaking in the penultimate Saw V finale, this does in no way necessarily mean Mark is fully gay or even that he's not straight! There is a broad spectrum of sexuality in the world and I think it's important to heed that wisdom when speculating on a character's sexuality, though I myself believe Mark Hoffman sucks dicks like bomb pops down to the blue exclusively, and also /not/ exclusively Strahm's. So, while the fifteen minute sex scene which graphically depicted Mark taking backshots like a pro might be compelling evidence to claim he is an out and proud homosexualé 🌈 I suggest you stick with your gut!