Sorry if this has been said before, and I know it's a little thing, and I don't have a screenshot of it. After sex it'll sometimes say "so and so manages to get on her names and knees"
I'm not expert on your intentions but I'm guessing it's meant to be "hands and knees"? A little bit of playing around found this in the scripts\newsexsystem.gd file on line 2182 (Using Notepad++)