About Freddie's 'ability'
Was Freddie impotent?
SPOILERS
When Miranda is trying to seduce him and they lie on the couch and he starts kissing her... Suddenly he stops, looks terribly frustrated and then he appears to have come to a certain realization. He goes on then accusing her of behaving like a slut and that's not what he wants of her, et cetera.
Could it be that when he stopped, with that frustrated look on his face, that he realized he couldn't perform in spite of her willingly offering herself to him, and then figured out he could just turn it into something else, blaming her for being promiscuous and avoiding the embarrassment that way?