Lol! I don't think so. That looks way too old for his time and the dude doesn't look like him at all.
Although I also find the notion of Kevin Sorbo appearing in a gay porn film very difficult to believe, people do strange and surprising things when they're young.
I would argue that there is a resemblance between Sorbo and the guy getting his dick sucked in this scene. Furthermore "Click Click" was released in 1980, the year in which Sorbo turned 22. As is often the case in the porn industry, "Click Click" was probably made and distributed within a short time frame, meaning Sorbo would not have been too young to have been cast in it.
I'm not saying it is Sorbo, I'm just saying we can't dismiss the possibility out of hand.