Juliette - the one day we were in a coffee shop and a group of blokes kept looking over and whispering etc (this is going back to when we were both 20ish so 16 years ago). Eventually my friend realised she recognised them as friends of the guy she was currently seeing.
She went over, comes back and explains they were whispering/nudging etc because her boyfriend, their friend, had told them that she'd 'let him' have anal sex with her and they wanted to know was it true or was he making it up?! She'd proudly told them it was true and they'd all fawned around saying how they wished their girlfriends were as 'cool' 
as her etc. I nearly lost my lunch 
This was a long time ago, as I said, but her life is still same now. She's a really lovely person too but has never had a relationship longer than 3 years, and that was only once. She has really low self esteem and validates herself through men thinking she's great, but I think they sense the insecurity and pounce. (some men).