Not sure the logic here is particularly rock solid. Santino already did a gay sex scene without much prodding. He isn't reluctant at all.
He has just discovered that's it is easier to do lackluster content for similar income than doing unnecessary extra hardcore scenes which... Regardless of enjoying sex with guys, is more work and has more complications attached to it.
it's considerably easier work to do solo or boring non sex content. Less drama, no need for constant testing, no worries about stds no dietary restrictions, no pain (if you don't like bottoming). There are plenty of reasons to not do xxx content regardless of sexuality. There are plenty of solo queer creators that don't collab at all.