What are the best visual novels for
3 sex scenes?
I have only read Steins;Gate, Saya no Uta, Katawa Shoujo, Ever17 and some Sono Hanabira games
Monster Girl Quest (the Lose and Be Raped VN), It's Semi-RPG but it's really worth the read, one of my faves desu, it's got tons of H-scenes and a huge, well-built storyline. Though, the VN only had Alice's route in it, the actual RPG called Monster Girls Quest Paradox had other routes like Illias, it is still being translated and will probably finish by the end of the year. There are sequels and doujins too. Definitely recommended.
Another one that I recommend is ぜったい最胸おっぱい戦争!! ~巨乳王国vs貧乳王国~ ("UltimateBoob Wars!! ~Big Breasts vs Flat Chests~" in English), the story is probably not as indepth as MGQ, and I know just by looking at the name that it sounds ridiculous but it's got lots of routes and tons of cute H-scenes. Parts of the story lines gets deep and sad too...
I recommend Flyable Heart, at first, the story looks a little bit light, but the more you play, you notice that is more complicated and everything comes together; the characters are cute and the draw style is from shana and suzumiya; the h-scenes are also cute, you get at least 2 per route
For the first category I'd like to mention 9 Hours, 9 Persons, 9 Doors and Virtue's Last Reward.
Of course, they're maybe more in line with escape the room type of games than visual novels strictly speaking.
If you like Phoenix wright and murder mysteries/battles of wits you should enjoy Umineko
You can use the PS3 patch if you can't handle the 10/10 sprites