Nifty is hands down the golden standard with that kind of thing; I only wish they would update their site with a searchable tagging system that most other websites in the same category use. If you're looking for content that's more specific than their range of broad categories, it usually means doing some sifting to get at what you really want.
There's a lot of those categories and they usually get you in the ballpark of whatever floats your boat, though ... at that point, it's worth the sifting. There's no kink-shaming to be had at nifty ... just thousands upon thousands of stories written by other horny people with the same kink as you. LOVE IT!