what i think you should do is to do what you want. honestly, if you want to have *** then do it. i wouldn't weigh so much of your decision on how it will affect the relationship. honestly, if you two are that close and are really meant to be or whatever, then *** won't make things worse. If they do make things worse, then it's better than you waiting a couple more months and having *** and ending it then. I think if your waiting because you don't want to start problems, then you are just delaying your problems and making it harder on yourself. If you want to have ***, then do it. Don't build your life around the relationship, let the relationship build around your life. If it doesn't work, then you still have your life. The problems occur when you try to change your life for a relationship and then you break up. Then your stuck with nothing.
That's my philosophy atleast. I have been through 2 tough break-ups before I finally realized it myself and I have been doing well since then. Good luck man.
EDIT: sorry, didn't see you already made up your mind. what i said pretty much just goes along with what you decided to do. good luck