I think sex, coming from any side is about domination and power. Yes, that makes it related to freedom, but that is about as uninsightful and pessimistic as the phrase “knowledge is power.” Knowledge is almost entirely not power, and sex is almost entirely not about freedom. That makes the relationship sex has to freedom special, but not very helpful for gaining freedom.
Why is sex not so much about freedom? You can gain power with sex, power over your children, power over your partner, power over the opposite sex in general, or the same sex. Sex is often sold in many ways, but there are forces of domination at play in the intellectual circles talking about sex-as-power (often disguised as sex-as-freedom, which is double-talk), and derivative circles, that will probably rob you of any power you might gain from thinking about sex (including gender) or enacting sex.
In the same way that focusing on the individual instead of corporations is a way of controlling people financially, politically, and psychologically, focusing on sexual identity is no different. The main effect of focusing on sex is it limits people’s ability to understand everything else. Just like if you only focus on yourself your ability for compassion and understanding others decreases (though not entirely). People forget more important things like happiness, peace, and an entire spectrum of wonderful human things that, yes are related to sex, but not determined or defined by sex. The secondary effect is groups like male and female and so many others jostle for power and in that setting power-players can play people against each other and keep control. Because sex is primarily concerned with power, powerful people (editors, etc) are able to control the dialogue. Other topics like happiness are not like this.
So if you decide to allow yourself to be pushed into thinking this is the central issue, you are feeding yourself into a patriotic power structure. Shifting to a matriotic power structure is hardly revolutionary to powers that push sex, it is like voting democran or republicrat to fight capitalism.