When they see money and Diamonds ?
Interesting that only two girls answered this question. Listen to what they say because they know better. I agree with what one said and it does start in the mind or in the fantasy. Women become aroused when reading sexy sections of fiction novels. For them, it really does start in the mind whereas it's a very visual process for guys. That's why hookers dress the way they do. They know this and dress to excite and attract guys.
It starts in the mind.
Lol, hard to explain..it just happens..lol
The same way men do. They just get off differently.