Asking the top or bottom ?

[Kyle]

That's a great question. I have been in the same situation, You are looking for a relationship and you like the guy but sex matters too and if you ask that awkwardly you can destroy potential good relationship.
I don't have any specific advice, just when I met my last boyfriend I liked him very much and I told myself " The guys is handsome and we understand each other so well, don't think about sex now, in any case there will be a solution." and then after a week when we became friends and later we got closer and we were both ready to have sex soon in nearest future that conversation popped up itself.
So my advice is if you really like a guy it's OK to spend a week or two without asking that. If he's totally incompatible sexually then you loose two weeks of your time but at least you get a friend.