> Few people care about sex but not gender.[1][2]

I don't think your sources support that statement. For example, [2] says:

> Surprisingly, among the 127 participants open to dating a trans person, almost half selected a trans person of a gender incongruent with their stated sexual orientation. For example, 50% of the trans-inclusive straight women and 28% of the trans-inclusive gay men were willing to date a trans woman, even though one wouldn’t expect either straight women or gay men to be attracted to women. Similarly, 50% of trans-inclusive straight men and 69% of trans-inclusive lesbians said they’d date a trans man, even though both groups are presumably only attracted to women.

This suggests that for between 28%-69% of people, it is the persons sex rather than their gender which is important for their sexuality. This result is unlikely to be due to transphobia as these are people have specifically indicated they would be interested in dating trans people.

The article says "even though both groups are presumably only attracted to women". It seems to me that this presumption is simply wrong. For many people, their sexuality is defined by sex and not gender.

11.5% of gay men said they would date a trans person. 28% of 11.5% said yes to trans women but all of them said yes to trans men too.

29% of lesbians said they would date a trans person. 38% of 29% only said yes to trans men and 31% of 29% said yes to both.

The article doesn't have the same information for straight people but only 1.8% of straight women and 3.3% of straight men said they would date a trans person at all. So 0% of gay men, 11% of lesbians, maybe 0.9% of straight women, and maybe 1.7% of straight men would consider sex but not gender. Probably the real percentages are lower. Probably some straight people said yes to both. Many straight men attracted to trans women wouldn't date one.

Porn with trans women is much more popular than porn with trans men. The primary demographic for porn with trans men is gay men[1] even though at least 10x as many men are straight.

The other studies also found few men only attracted to trans women and cis men.

[1] https://www.ibtimes.com/transgender-porn-best-seller-it-good...