Is it normal for a cat to be very interested in human sexual experiences?

Cat. Overweight. About 10 kg/22 imperials. Neutered. Middle aged. I'd say compared to other cats he's weird and used to try and gay rape the other cat we used to have.

So. Night time. Cat sleeps on the desk. I'm yanking one out, trying to get to sleep. He wakes up, plops his mass down on top of the sheets, purrs.

Obviously, this usually annoys me and I gently shove him on the floor, but this behavior of his keeps repeating at least once a week.

Like, do cats like watching orgies? Do they try to get all close and personal when people are fucking. Do other animals perv out like this?