Sure, its only a holocharacter, but still...are you a cheating bastard???
Yes.
Just because it's a hologram, doesn't change the fact that you are fucking somebody who isn't your wife.
A hologram may only be a simulated human being, but it's still a human being. Doesn't matter that it isn't sentient - if it looks like one, walks, talks, fucks like one, then effectively it IS one. And even so, as we have all seen, some holograms *are* sentient, such as the EMH and Vic Fontaine.
The way I see it is, if your sweetie is in the holodeck fucking some random hologram, then obviously they don't want you, otherwise it'd be you in there with them and not the holo-skank.
The point is, porn is mostly watching, and maybe learning from what you see. A holosuite is just too much doing with something that isn't real. And I'd rather he talk to me, that we learn and experiment together if need be, wait for me if I'm injured, than take some quick fix. Sex is addictive, but he'll be that much more eager when I'm ready. I'll just find someone who wants to be with me, and only me- not even replicators and a holosuite- who knows it would never compare to the real thing. 

) or Grathon Tolar.