Attraction is transferable. If you get a girl turned on and walk away, she’ll still feel attracted and the next guy can pick up where you left off.
I think the source of emotions- the limbic system, is blind in this way. Let’s look at fear. You can watch TV shows about the end of the world and you might get a feeling of anxiety. Than the commercials come on and capitalize on your heightened feeling of fear, selling things you need to help with that you don’t actually have.
Moods are blind and color everything. This is why girls get bitchy towards everyone when they get P.M.S. Being in a state of arousal works the same way.