Hey there! Super flattered to hear you like my work.
There are 10 Endings related to being reduced to 0 Penis Length by the various monster-girls. Using the Attractants Beatrice sells will make it easier to get specific monster-girls.
Hitting 0 Penis Length but refusing to go with the monster-girl who finished you off gives you the Maid Ending.
Going to the Adventurer's Guild, insisting that Camilla the Guild-Leader lets you into the guild and drinking the Full Moon Oaksplitter will give you a secret ending. There are also secret endings obtained by accepting Ms. Mauney's alternate payment method when you only have 1 inch of Penis Length, and by abusing the Quickshot Potions Beatrice sells until your Max Will is reduced to 0.
The dialogue choices you get when speaking to Andrea after reaching the end of the forest have three different endings associated with them. One for mistrusting her and touching the basin, one for persistently trying to push her into sex, and one for freeing her normally.
Hope this helps, and I hope that you continue to enjoy my game.