Frank must have forgotten how upset he was when Moesha was seeing older men. Yet he has no issues with Dorian doing the same thing.
He didn't even get upset when he learned the Dorian and his new girl were sexually active.
That does send the wrong message to viewers that it's all right for boys to seek older women, but girls can not do the same thing. Which should not be the case. As a parent Frank should have do more about the situation.