Yes but it already takes a base level of willingness/comfortability for a straight guy to get fucked on camera in the first place.True that many performers do take the blue pill to do a scene. Go watch some of SC BTS videos and you can see that they have to do many takes for a scene. And in between takes, they watch straight porn to keep them "motivated". Sometimes SC will actually have female performer on set to provide visual stimulation especially with newcomers. So all the videos you see on the website are highly customized and edited to give you that fantasy. The fact that you are questioning whether those performers are straight, gay or bi and that you believe some of them (the straight ones) do enjoy anal sex means that they have succeeded in selling that fantasy to you.
Disclaimer: a handful of SC models are actually openly gay or bi. Manny, Daniel, Dale, Cody Seiya, Tanner, Brendan.. to name a few.
Seeing how our knowledge of sexuality has evolved over time, I really think most performers are varying levels of bi with most leaning straight when it comes to love and women but ok with physically being with a guy.