You don't mocap sex scenes period, not even FOW studios is mocapping it's sex scenes, just it's regular scenes, and FOW Studios Subverse game is a hardcore porn game that uses mocap for none porn scenes.
After for body type, only tails, heads, and wings will be issues, and that can be worked around, I mean none of it's much more challenging them height differences. Tieflings already have tails, and horns, so that shouldn't be a problem for other races. Kissing might be weird with some heads, so skip kissing or add licking in it's place. Wings are the really tough one, but it's do-able.
I'm curious what happens during sex scenes when one uses the playable mindflayer mod.
Let's just forget I ever said this lol, I did not buy BG3 to jerk off...
