When we born, our brains are almost the same. It's just later, with the stimulations from our environment (notably our education), men's and women's brains got differents.
And individual are not affect the same way with the same quantity of hormones. Men have biologically more testosteron, but what about if women need less quantity of testosteron to get sparklings in the panties?
I personnaly think the whole humanity got totally wrong with the assumption of men more sexual-oriented than women.
Same for almost all generalizations Elithium wrote down. We have been brain washed to believe it.