I think that it is up to the individual couple and how emotionally intimate they have become.. However if you have been dating for a while, and still are not exclusive... somethings up!

Communicating with your guy about this could be a good idea (if you have been dating for a while.) Ask him so that you cantry to see how he sees the relationship. Don't try to read his mind or interpret the signs it will only give you a headache.

Also be aware that some guys have issues with making that step to girlfriend/boyfriend status so be patient.

I agree with snowygirl. Hopefully you are "exclusive" before you start sleeping together. I have made that mistake before and all it leads to is problems.