hmm i have played 5:
FSN (of course)
Saya no Uta
i'm still waiting for the english translation of FHA and School Days and Summer Days, but i allready got the games.
PS: yeah i know this might sound like an excuse but i didnt really play those 5 for the hentai in it. if you know these visual novels, you realize how less hentai there is in and how long you have to play to achive it.
these games just do have an epic and awesome story, one should not miss.