Is it normal that im curious to want to know this answer

It really depends on the guy. I could list a hundred things for myself (although I wouldn't say all of them in public) and other guys on the site would probably disagree with half of them.

If it's a specific guy you're trying to turn on, maybe Google some answers, try them and see what gets a response. If you're talking guys in general, though, put the answers in a poll and we'll all vote on it, so you can see what "most" people like

If you want to turn on a guy, have a vagina.

you could watch erotic things in the internet or try getting a girlfriend,

Tell him you would like to pleasure him while kissing the neck. Then ask where he wants your mouth!!

If all else fails, the following statement has always been a save.

Tell him he can put it anywhere!

Show him porn, that should do the trick

@iEatZombies_ What? ^^^^

Sex. With something not unattractive.
Usually.

I could be wrong- I'm not a guy. I still think it's sex, though.

Aha wow, not really what I was looking for.