I'm afraid it ha to do with domanince Brat. A woman, at least in most circumstances isn't the dominante one in a sexual relationship, (you ladies tend to favor aggressive and "strong" men as well as find them attractive). As the submissive role it pleases men to see you sexualized by "making" you at least symbolically lick your own and other women's pussies to show us that you will do anything depraved we ask of you.
Obviously Dom Sub relationship can got either way with the role of sub being played by man or woman but generally that's because we, (menthat is) allow or desire it. As progressive as we may claim to be as a species we are all still racist, bigoted and sexist, although many of us try to be different from that.
That being said there are many men, myself included who if their woman so desired and was genuinely turned on by it would eat their own cum out of their pussy, (although I'd be kinda grossed out by it, and being grossed out might feel abused and degraded and thus probably turned on)
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