re: Longest friends w/ benefits relationship you've had?

I've had a few thats lasted quite a while.the longest when I was 21 and she was 52.most recent was 3 yrs ago ,went on a few dates before she asked if I was seeing anyone else and I told her I had two women that would come over now and then or we'd go somewhere. She was cool with it she said because it would be a while before or if she'd have sex with anyone. She held out for a month. And immediately wanted to know who the fwb's were. I will not say and it pisses her off.