Sometimes you feel like a nut, sometimes you don't
This is a perfect response.
Sometimes I feel like sex with a guy, sometimes I feel like sex with a woman.
The times when I "just" want sex, I will hook with my male bi partner if I am single, as its quick, easy and there is no emotional entanglement that follows. There is no need for him to wine or dine me or to engage in courting, we meet, we know our roles, we have sex, were both satisfied and gratified from the sex, I then leave till the next fuck. You cant do that with a girl so easily.