Oh.... Sometimes such things no need much to be said. If both of you feels comfortable with each other, then let the feelings do the talking.
I once had a ex-gf who doesn't wants a relationship with me but only wants sexual needs from me. And we never talked abt it at all and till now we are still good friends.
Guess she likes to have no commitments in an underground love but fulfilling her needs at the same time. (maybe I should start writing stories too.. Lol..
)
If both of you feels the same...Mai tu Liao!!! Ups Liao!! =p