It came out in Japan as an all-ages game man, there's no adult version at all... you really have the wrong game. Hell, the entire series has been on PS3 and XBOX 360 and never left them until now. You can't make porno games for those consoles.
Here: http://agarest.wikia.com/wiki/Game_versions
The closest you can get is their booby mousepads and pillowcases that came with their limited editions. Both of which have no nudity.
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Frumple: People say the game sucks. I want to try it though, curious about how the marriage and skill transfer works.
Maybe I am just misremembering things, but yeah it wasn't straight porn. But really, the only images from the game I remember clearly is like a bondage scene and some other stereotypical fanservice things like "Oh I got all the vanilla ice cream on my face hee hee" and another where a girl is like suggestively eating a banana, present on the game's box. I swear to god I'm not crazy here, I actually remember this stuff.
... so how's the game itself? The trailer and screenies looked... almost tempting. I mean, I enjoyed that GBA (NDS? One of the two.) one with a similar wedding-dress-magical-girl thing rolling well enough, and everything else aside Sengoku Rance is a pretty good game, so gratuitous fanservice isn't exactly a turnoff. S'just often used to obfuscate otherwise iffy mechanics, which is why it makes me a little wary, heh.
Well, I played it for a little bit when my friend got it, and I absolutely hated it. Which, in a way, made it hilarious that my friend blew like 80 bucks for the box set I was telling you about.
That's not the really funny part though. The story goes: me and my friend co-habitated in what was basically a college dorm room. He brought a large, several foot wide tv and xbox 360 from home to play his games on, and while he was playing it, I had the bright idea to set up my tiny 11" tv and Playstation 2 right next to his rig, and I played Atlus'
Thousand Arms, which is another kind of RPG/Dating Sim combo game. As the games progressed, it became funnier and funnier that my game made in 1998 was just beating the shit out of his game, gameplay and entertainment-wise. He basically ragequited when his game just kept stomping him in the ground with it's bizarre difficulty and interface, boring him with awful dialogue and cutscenes, and not giving an inch in fanservice.