Here's a quote from the bonus section of the game (that you get if you unlock all 3 cheeses):
"The sex scenes were removed due to a desire to keep the focus honed into ENF and clothing damage."
But to elaborate a little more on that, I had trouble fitting it into the narrative in a way that felt good to me, without breaking consistency with the characters, and that didn't make people go "well why isn't there a sex scene for every ending" so instead it got changed into a sketch and added to the bonus pages.