I would say you should figure out if you’re looking for a casual partner or a relationship.
If you’re looking for a relationship, then this might just take a bit of bravery. When you start dating someone and get to the flirty early sexual phases, you could bring up the different things you like starting with milder activities or attributes like (I really like your tits/pecs), then ask them what they like. After a bit of conversation like this, segue into if they have any secret fetishes (in a flirty way), and they inevitably will respond with the same question. Say, “well, there’s one. It