Yes and no.
I am not, obviously, constantly hard and jerkin' it while working. It's work, and a lot of it is somewhat mundane. I've been going a WHILE on the wolf area now for example, and I haven't even gotten to most of the sexy stuff, because I have to lay down the "ordinary" game first.
But obviously I do enjoy what I make, yes. That's always been my metric. If I was writing horror stories, I would want them to scare me. As I'm making porn games, I want them to turn me on. If they do, they have a good chance of doing so for other people too. And yeah, working on a particular thing over time will bring it in and out of being super hot, but it comes back after time, and these games are so big at this point that I'll often end up working on something for one pass, go off to do other stuff, and by the time I come back to do another pass (say the art) it's fresh and fun again.
But yes, I do, and it's not accidental, it's essential. It guides what goes in and what doesn't. Gotta be hot, or it's no good.