List 2 Hentai anime

How about three
Boku no Pico
and the truly beautiful sequels
Pico to Chiko
and
Pico x Coco x Chiko

There isn't much hentai though. It's mostly about Pico's journeys throughout the world, meeting new people along the way and growing stronger with the help of his new friends. It's really heartwarming, if not for the sexual scenes it'd be a wonderful family anime. I'm sure everyone who has seen it can agree fully.

Aisai Nikki,
Aneki : My Sweet older Sister,
Sei Yarian Enkou Nikki....There's more but I can't think of any

Mankitsu Happening, Cafe Junkie, Fault, Variable Geo Neo, I could go on forever. :P

Karen
Bible Black
La Blue Girl