It was a third party book for 3rd edition that included just about everything you’d want to know (or not) about how to include having sex, with just about everything and anything, in your game.
It’s contents can be sometimes hilarious and at other times extremely creepy and problematic. Some of the prestige classes included in it are extremely broken. But on the bright side it does give pricing and equipment slots for butt plugs.
The only PDF I could ever find of it has what looks like public hairs on every page.
hahaha I have the PDF of this, it’s very uncomfortably funny