I actually had a friends with benefits situation for about 2 years before i met my husband. We were both very clear about our intentions - we were friendly - hung out, fooled around, and he went home. we contacted each other when we wanted to.....have benefits....and that was it. We saw each other when we both weren't dating someone....it suited us both fine. When I got engaged he was so happy for me and it was over just like that. I run in to him from time to time and it's not even awkward. Maybe we are an unusual situation, but we just had it worked out.