[Impressive1]

I was hanging out with friends and they invited alot of their other friends over, I thought this one guy was pretty cute but never really thought more than that about it soberly anyway, I ended up sleeping with him,he's only 22. The next afternoon he acted mature about the situation and glad that it happened, he asked if he should give me his number. I wouldn't mind seeing him again, but I would rather our mutual friends not know what had happened between us. Should I call? Is 8 years to big of an age difference? If I should call, how long do I wait?
This isnt' something I normally do, in fact, I have been out of a relationship for a few years now, and never have one night stands. What do you think?