I think I'm in the minority. From what I observed, femdom kinda can basically broken into cliques like any other community. It seems the majority is into lighter things, like tying up/foot fetish, sumata, things like that . Pegging/water sports/smells/sweat are a bit more niche, there doesn't seem to be as many. Occasionally some of the "ventures" femdom/footfetish people might try a prostate massage or a finger, but its kinda rare for strap-on stuff. That said, I don't have any hard, factual numbers. Like with any community, some people are more vocal than others, and people that like pegging and more extreme stuff tend to keep quiet because people are very vocal at their disgust.
But if I am perfectly honest, just openly talk with your partner and stuff about what you are into/wanna try/etc. May not agree on everything, but like, if you never even discuss it, there is no chance of it happening, and that leads to boredom/bad sex. At least in my personal experience. Sorry for going off topic.