Wanting to mate and being pervert are not the same thing. Wanting to mate is normal but it's sexist and wrong if goes over the other person will.
It's not that complicated, really.

P.S.: I'm a guy.

BTW, real feminism seeks for equality, but it's not called "equalism" beacause, due to the fact that women are opressed in this society, in order to achive equality you need to empower women.

that is a huge misunderstanding of feminism (or at least the real one)
finding a woman attractive it's not wrong, it is only objectifying if her looks are the only aspect on wich you value her as a person, forgeting that, as a human being, she has not only a body, but also a mind and emotions.
And that works both ways, whether you find it attractive or not, you're only judging a person by her body.
Also, it's wrong too if a woman does the same thing, judging other people (men or women) just by the looks.