Everyone has their own likes and dislikes, whats okay for some is not for others, that's what makes us individuals. Some like a bit of rough sex and a good hard fuck but in the right context, others like their fun to be sensual, other a little of both.
That's why a bit of a frank discussion about; who's, what's, and where's, is something you need to do before playtime starts. It's no longer fun if one party is being too rough/gentle, or just not pushing your buttons.
What you want is a personal choice. Just because you made contact on a swingers site and the meet might be for sexy fun doesn't mean you don't have a say in what happens.
Although being open minded, exploration and pushing your boundries are opportunities to be embraced at a meet & the reason many of us are here ... to boldly go where we have not been before.
But the operative word here is FUN it shouldn't simply be meet for the other persons pleasure.