Because there is nothing more pure and wholesome than the love between a nerd and a slut.

This thread is for manga or doujins where the MC ends up in a romantic relationship with a slutty or sexually experienced girl (NOT the typical netorare plot where a pure girl gets stolen from the MC and corrupted into a slut).

I'll start:

"Boredom of Seguchi Yuuka" by Son Yohsyu
https://e-hentai.org/g/1024459/1fc3b1e009/
https://exhentai.org/g/1024459/1fc3b1e009/