I feel that with those thoughts in your head.. that you need to stay away. I have girlfriends that are very beautiful and not once have I thought about "boinking" her. I value her friendship that much to not bring it to that level. if you wont do anything with her, then you should have her know that your wife means the world to you and its just friendship and have her meet your wife. Your wife needs to know about your friend.. remember in marriage there are no secrects! this isnt your life anymore, its both of your lives together..

just my $.02..