If you want a REAL hentai game (Sexy beach seems more like an Ecchi game), try out Artificial girl 2. Now THAT is an Hentai game... I won't give any links or anything to it, since it is a real porn game, and I bet there are some people here too young for those games here?
Other then that, battle raper is a good one too, tho Artificial girl is better. battle raper is a fighting game, where you beat the girls 'til they are too weak to fight, then the 2 characters have some fun instead.
I have both lol. Great games.
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