My gf has some low rent friends who talk about nothing but their sexual preferences and permutations, plus her sister is a total swinger, so I do have some safe pockets for conversation. Never with the family, though. We were all raised Catholic, so sex, for the most part, doesn’t exist.
I’ve found that the small, mountain town where she lived for 15 years is a pretty perverted place in terms of its populace (no alliteration intended), and most people know each other’s business (or think they know), so there’s a lot of information circulating. Also, healthcare workers can be pretty open (and naughty), I’ve found.
If you feel timid talking about it, I think you’d find that at least a few people around you would be able to relate. The trick is feeling out a situation and guesstimating who is safe to talk to. You could also steer a conversation that direction and then see if your companion makes the first move.
We all have our dirty secrets. Some are just more honest about them than others. Check out postsecret.com on a weekly basis, for example.
P.S. If it has anything to do with animals, I don’t want to know. ;-)