Hmm....by that logic...If I show a porno game to a kid...I could create the anti-christ! *runs to his evil layer*
Alright alright, kidding aside, I don't think it really matters. Either way kids are going to learn about sex and violence. If their parents raise them well and don't make it a forbidden fruit the kids will see the games for what they are; games. Its that simple. As for porn, it still comes down to the way they are raised. Instill in a child the fact that personality and emotion are the most important things as well as the knowledge that what they might see on the internet and in adult movies (and come on, it is inevitable that they will.) and they won't set unrealistic expectations.