It's not a question of "Is it okay since there are other more _____ games out there?" It's a question of "When is it too far?" Fill in the blank with whatever you wish: violent, sexual, or vulgar!
You can read the other reviews for what exactly is in the game. I haven't played it myself, although I have heard much from my friend and I have seen parts of it while over her house.
Admittedly, the game's graphics are nice. It's really fun to be able to pick different backgrounds and stories (as is why it is appropriately named Origins). However, don't let the nice graphics fool you!
I've read many reviews--for games, televisions shows, you name it!--that say "there are games that are more violent than this one." Does allowing your child to play this game because it is not the worst make it right? This is a great example of tolerance. By allowing something to happen because it is not the worst, you are gradually making whatever used to be seen as wrong "okay" or "tolerable." Eventually, the line will continue to be pushed back. Is that okay with you, as a parent?
I've decided, although I am not a parent myself and I'm not even an adult yet, there are some things I can simply not tolerate. I do not like to expose myself to sex, violence, and cussing, but I know it's out there and I cannot avoid it. I have decided, I won't expose myself to any more of it than what I can't control.
I agree with a previous review who said you should know your kid and what they can handle. It is especially important to talk to them on subjects associated with the game: sex, alcohol (it isn't the biggest problem, but it's there), violence, and moral decisions. I wouldn't recommend the game for a child, but if you do let your teen (or younger, God forbid!) play the game, you must, must, MUST talk to them about the themes and what is right and wrong. There is no doubt they will come into contact with similar things on television, in commercials, and in the real world. I also agree, if your child has trouble distinguishing reality from fantasy, make sure to stay away from this game. If that is a problem, I suggest you tackle that immediately! This game is the least of your problems in that case.
In my experience, everything that the Mature label warns is in the game... IS IN THE GAME! So if you have a problem with your kid being exposed to sex, nudity, crude language, and whatever else is on the label, then don't let them play it.
If you have to, look up scenes from it online. Decide for yourself if your comfortable with letting your kid play the game. Dont' wait until it's too late: your kid is playing the game and opts for some sex with an NPC. If you're not sure if the game is appropriate, then skip it. There's no harm done that way.