Swinging and Sex sites are often very different to the ones i listed which are dating/social sites.
The vast majority of people on dating sites are pretty normal.

I did meet a girl from a swinging site once though and had her squirt all over the back seat of my BMW...lol also another one who was into Cuckholding (bascially means she is married and her husband allows her to go fuck as long as she videos it)
she was walking up my stairs and i was fingering her hard from behind and she was squirting all over the place on the way up to my room...