In my view, if in an LTR, or marriage, if a woman is repulsed by the idea of giving her husband/boyfriend a blow job, she is not sexually attracted to him. Now, note the word idea, which implies the thought and intention. For example, if a woman, wants to give her husband head but it's painful because his penis is huge and doesn't really fit in her mouth, that doesn't count. Additionally, I believe this the other way for myself, If I was repulsed by the idea of going down on a girl, I probably am not that sexually attracted to her.

thoughts?