[bob33212]

Generalization is the problem. It is not accurate to say that all gay relationships require two penises.

It is also wrong to call a lesbian transphobic because she finds testicles unattractive and vaginas attractive. She is entitled to be honest about her sexuality.

[sascha_sl]

I can't believe I need to say this, but there are trans women with vaginas and without testes.

Nobody says you're not allowed to have genital preferences. Chromosome preferences (with everything else equal) however seem legitimately transphobic to me. They're more a rejection of trans people than stemming from a preference in attraction.