I've played a ton of Ren'Py games and most don't have autosave.
Anyways, my point is don't assume there's any autosave in porn games because devs love to waste your time.
before i say anything else i completely agree with your point
ren'py has autosaving on as part of it's default setting and i know you've played android life, mgd, divine dawn and superpower all of them autosave
but ren'py autosaving sucks and your better off without it with few exceptions