I dunno man... women who are hypocritical, stupid, and use guilt... sounds kinda realistic to me.
Edit: But honestly, Ophelia being possessive of Sterling and protective of Aliza are totally believable behaviors. Besides, it only sets up a temporary obstacle to be overcome, which makes the reward that much sweeter when Ophelia inevitably gives in. It's more believable than her becoming instantly supportive of Sterling's every desire, and that makes her a more interesting character than most of the fuck puppets in these kinds of games. There are so many other games that are simplistic fantasies written by (probable) virgins, it's refreshing that this one actually has some layers to it.