OK, let's do this. I'm pretty adventurous myself - generally so long as it doesn't involve bodily waste, I'm down - though I do have a few preferences - mythical creatures, just-beyond-realistic bodies, and mental changes to go with the physical.
Director, who I know, got away with posting some forum RPs - all I have are some chat logs, but they're here if you want to see them;
http://www.ensnared-rp.com/index.php?topic=446.0 - Rin Toshaka and the Sl*t Machine
Bimbofication, BE, yuki-onna transformation, highly sexual. This was fun - I had to bluff a lot because I didn't know the lore at all.
http://www.ensnared-rp.com/index.php?topic=463.0 - Legend of Zelda: The Spell of Kyoko
Adventurous, somewhat sexual, humor if you're familiar with the Zelda series. Not too much humor, mind - I'm not InLeaves, I don't make things too meta to be sexy. I hope.
http://www.ensnared-rp.com/index.php?topic=468.0 - Glamour Casino: Midnight Channel After Dark
Fun times. The lore characters in here were high schoolers just on the legal side of eighteen, so to keep things from getting too creepy, I made sure that they were only doing sexytimes with each other. Very empowering transformations, if you're into that.