Right to the point: in a game all about choices and roleplay, it seems really odd that the game locks you out of entire animation trees during sex scenes based on what body type you choose at the start of the game. From what I've read from others and tested myself it seems petite body types = bottom, large = top regardless of genitals. There's no warning that this is going to soft lock you when making the character.
I put an additional 40-60 hours into my Dark Urge playthrough, getting really into roleplaying, but then got jumpscared by my character being forced into a bottom role. No matter how many times I quick saved and reloaded there was absolutely no way in game for me to choose how the sex scene went -- aside from stopping it. Instead it was chosen for me because of the body type I picked?
Don't get me wrong, I've plenty of characters I've made already who I'm happy to go down that animation tree with. But my choice to decide if that's what I wanted for this character was taken from me, entirely souring this playthrough and making me wildly uncomfortable.
So, my suggestion: add a dialog option to all sex scenes that allows you to dictate which animation tree you go down. If needs be it can be locked behind an intimidation roll, that's fine, but I see no reason why we can't chose that in a game literally about roleplay. I understand there might be some weird jankyness to some scenes, i.e. Astarion picking up a jacked character, or a skinny one picking him up, but I'm fine for a little jank as long as I'm the one to make that choice.