Should I wait?

I have a weird question.

I am a virgo and I've been dating this gemini for about three weeks now. I really like him and it seems mutual. There's loads of chemistry.
I am going to his place tonight and I am a bit nervous because I think I'd like to have sex with him for the first time.

Before this gemini, I was dating a cancer (who pretty much led me on and broke my heart to pieces) and I know those boys like the chase and like to wait but how about geminis?
I read somewhere that they don't need to be emotionally involved to have sex and that they're usually quite cold.
Should I wait just so I can be sure he genuinely likes me or should I just follow my instinct?

Sorry if this is a bit of a ridiculous question. I am probably being stupid.

Thanks for your reply. I guess I'll wait, then.