I think it basically comes down to societal standards but I'd say a great many of them are strange compared to your average female. In my experience, people who do "kinky" things in bed often make the decisions to do so for a reason and those reasons end up peaking into their daily personalities, especially at a young age and I'm 25 so I've primarily only dated girls 25 and younger. (bear that in mind I guess).
But yeah, those girls have had reputations of being odd in one way or another for the most part. I'm not saying they were complete wackjobs, I'm just saying that if you asked ten people about them, at least a few of them would put their finger on something they felt was different from what they see in most people.