Should I have with him?

I've been sort-of seeing this guy for a few dates, and I'm so ually attracted to him (we're both adults) and I really want to have with him. We're more just like a summer fling, so I don't think I'll get emotionally attached. The only thing I'm really worried about is an STD, but if I wanted to, I could probably get him tested and use condoms, and I'm on the pill. I guess I'm just scared of being considered promiscuous, even though nobody would know about it...I would feel bad about myself. is this just a stupid cultural hangup? If I were a guy there'd be nothing wrong with it.