I joked that contrarian anons here would start saying 4 isn't the worst one when the series got more eyeballs on it again. I wasn't actually being serious

>>715508270
then we'll have another one

>>713418497
The main answer is because the games too old. It came out in 2003. The internet being flooded with a dime a dozen porn artists making lewds for virtually everything like today hadn't really started yet and it's quite likely that a lot of things that were made, were simply not archived. Also the game maybe didn't The game is also relatively obscure in the mainstream consciousness.

Now if SH3 ever gets remade, which is certain, we'll very likely see a lot of Heather porn.