how do you tell the guy you've been sleeping with that he's bad in bed?

So I've started online dating a little while ago and I met this really cute guy. We went on a couple dates and had a lot in common and he made me laugh and he's really pretty to look at too. The first time we had sex, we were really drunk so I THOUGHT it was okay. But the next couple of times have just been pure awful. Like just lay there and pray that it's over quickly type awful. There's no foreplay AT ALL and have I mentioned he hasn't gone down on me? How do you tell this really sweet dude that he sucks!? Please help.