I literally just asked my ex to be bang buddies. Said something like, "lets have a little fun, just between us." and she was totally down, and it worked for a while. But make sure you have more than one girl to talk to, I got one-itis and ended up back with her...I have another one though. I talked to her twice for less than 10 minutes each time and she randomly took my number and texted me one night to hangout, came over, sex, and now its basically whenever I need some I give her a ring.