I think that 9 out of 10 dentists would tell you that if man has sex, he enjoys sex. Now, its not to say that all sex is good - quite the contrary, actually - but most men are just happy to be boinking somebody that we're generally not going to NOT enjoy it.
Now some guys are just quiet after some lovin'. I know I don't feel like having a really emo conversation about what just went down. Other guys are very vocal about the lovin'. They want to talk about all the things you did good. Kind of the same way that a lot of women are after boinkage.
One way to tell if a guy didn't enjoy sex is if he intentionally doesn't speak to you afterwards or makes a bunch of very vague references to bad boning. Or says things like, "wow. that was different."
I think you can probably rest assured that your guy enjoyed your special place. The only time to worry is if dude says something jacked up or never calls you again. And even the latter just means he only wanted the love box, not that he didn't enjoy it.
Just do you...errr, him, and make it rain. Anything less is uncivilized.