I've been taking a look at the pre-release and thought this could be a way to introduce riding positions.
You move your character to a static item, such as a bed or chair. Using the cursor, you click it. This doesn't move the object, it will only "grab" it. When you now press the Use key, your character will go through their own animation where he'll sit or lay down. Then you can order the NPC to ride in a couple of different positions. Naturally, cowgirl, reverse cowgirl, sitting blowjob, lying blowjob, basically anything you can do in those positions.
To make it work without freaking out the game, the girls would likely have to not be able to mount you should your character not be fully erect.
This was just a thought I had when I was fiddling with the dungeon. Be nice to have.
Also, the ability to remove your own clothing would be nice.

Even if it's just a menu.