I had a weird but useful bug: when I pressed Escape during sex I didn't opened the menu but jumped to the next animation (So I reached orgasm in 3 seconds). I first thought that it's a new feature but looks like it's just a bug.
I find this bug very useful since I have sex NPC only because of collectible energy and sometimes I'd like to skip it.
Also I would like to suggest a possibility to control whole sex process, because sometimes I want to make it longer, sometimes shorter. I bet everyone would like that. Also it'll be cool to add a selector in settings for basic mode during sex: auto (current one), controllable, skip.