Um, no. The guy is still sexually aroused by the images of naked women. He is imagining that he is being pleasured by the porn girls, not by a man's hand.
Following your logic, if a guy masturbates while also being able to have sex with women, he is bisexual.
But he isn't being pleasured by the girls. It is a man's hand.
In any event - if he can only get aroused through imagery and not the real thing, then he's handicapped and impotent.
His love is in the sink.
I know you guys that are into porn don't like hearing this.
But face it - you're pervs.
And, don't knock the homos: You are closer to being one than you think.