Not even close, though not an invalid presumption. I used to keep my gender identity confidential for deviant sights such as this. I thought it gave my personal identity an extra layer of security. With that, I also tried to behave as gender neutral as I could by imagining myself as a boy or a girl, on and off. I also included lots of male and female omorashi/omutsu just so I wouldn't give my self away.
At one point, I decided to just spill it and be the thing that I am, which is............MALE (big surprise) That's right. I have two Adams apples, three Y chromosomes, and fists for nipples!
I went through some interesting lengths to preserve my gender confidentiality, including flirting indiscriminately (once). It drove people nuts. Interestingly, my taste for entertainment is also unique in that it includes shows targeted towards boys and girls, plus I'm a sucker for bright, fruity colors and cute things. One of my complaints was that women had all the best clothing because women's clothing tends to have brighter, curved patterns.
I did ponder my gender identity at one point, and I had to conclude that the more "feminine" aspect of my tastes had nothing to do with my "feminine side." It's because I'm autistic.