There is no way this can be true. Sex takes two consenting people; there is no "gate" to be unequally "kept" because both parties have autonomy.
Trying to shift to "social scales" to escape the central role of autonomy is a nifty trick. But casting individual bedroom decisions as a matter of social equality is to presume a degree of entitlement in the bedroom. After all, we're entitled to be treated equally, right?
By governments? Yes. By our managers at work? Yes. By those who we desire? No, not at all.