Ah I see, well perhaps I do not know what the correct definition of a feminist is. I understand and respect this position that you speak of and it's good to know you are not randomly burning bras XD
Bra-burnings never actually happened; it's a myth made up to make feminists look silly and encourage people not to take them seriously.
Feminism is about achieving equality between the sexes and abolishing the many gender-related double standards and expectations that harm people of all genders in different ways every day. There are occasional nuts who hate men and call themselves feminists, but the fact is for any ideology or movement whatsoever you can find nuts within it who don't represent the whole.
Anyway, it's a double standard rooted in the same elements of Western culture that underlie polygyny and the standard of men proposing to women instead of the other way around (and likewise men asking the women to dance, etc.). Men are traditionally supposed to be the ones to approach the woman, while the woman chooses whether to accept or reject him (that role having been given to her over her father as times changed). People admire men who sleep with many women because that means they have been "accepted" by many different women, which indicates they're widely viewed as desirable. Women who sleep with many men, on the other hand, are just seen as having low standards for who they're ready to "accept".
Or, in other words, that awful joke about the key and lock is actually pretty accurate about the attitudes that gave birth to the double standard.
Of course, if people realized consciously that that's the reason behind this whole thing instead of having internalized it as a women=****s thing, they ought to reverse the standard for modern situations where the woman is the one to approach the man, because then he's the chooser and she's the one being evaluated as desirable. Plus that today men are really in just as much of a position to accept/reject as women, since even when they do the approaching they have every opportunity to be picky about who to approach (instead of being expected to find a respectable woman to marry when they get to a certain age), so we ought to be decrying them as ****s if their standards are loose, too.
Or maybe, you know, we should just ditch the whole idea of people being ****s if they have too much sex to begin with and let what adults do consensually in their bedrooms be their own business.
They taught female masturbation in the sex ed videos they showed us in ninth grade, to a chorus of "EWWW" from both the boys and girls in the class. The male masturbation bits drew more laughs, but that's probably largely because cartoon penises are just funnier and less gross-looking than cartoon vaginas.
The more disturbing part was that they had two kids narrating it who were probably teenagers in order for us to relate to them better but unfortunately sounded about nine years old. There is something deeply unsettling about hearing what sounds like a cheery little girl's voice piping up about how penis size doesn't matter.