Then how are they trans? How do we define it? I've asked this question before, and other than "they feel like the other gender" I've gotten nothing.
Francesca was referring to Puppycow describing a sexual fantasy where he is female. But he is not trans and does not desire to be a woman. He is not distressed or uncomfortable with being a male and therefore not dysphoric.
My definition of trans requires dysphoria. (I'm aware there is debate among trans people as to whether dysphoria is required to be trans.) While it is likely true that they are the other sex in their sexual fantasies, their dysphoria does not revolve around intercourse. It involves pretty much everything they do and, just like cis people, not everything is sexual.
The truth is I don't understand it. I'm not really sure someone without dysphoria can really understand it. Somethings just really can't be described. What does the color blue look like?
It's very easy to view it in terms of sexual gratification of some sort. That's something we can imagine. And I think that's why so many people write trans people off as some kind of sexual perversion. Especially when there are fetishes and such that look an lot like transgender. (Rocky Horror Picture Show?) But I think that's too simplistic.
Now, if you DO classify trans-genderism as primarily revolving around sexual gratification it makes the whole argument about how trans people fit into gendered spaces very nearly black and white. But I think it's more complicated than that.