Nathan Bronson definitely actually had sex, but I'm going to believe Nick Fitt filmed a video for them when I actually see it. Every couple of months he posts a picture of himself on set there, and we have yet to see any scene involving him. I strongly suspect he does some behind the scenes work, and is now just playing up this joke about being "straight for pay."
I hope I'm wrong because I'd love to see him do a straight scene, but it's telling that after all this time we don't have any video or even pictures of him in a sexual position.