I will play with everyone. But I adore variation.
I will never turn anyone down for their gender, but will admit to being more excited to write with a gender I haven't written with for a while.
In the end the writing is what's most important to me. If you're good, then I'll write with you. Which is kind of fucked up of me, isn't it? Some people will never write in a fitting way to me, they were born that way, while people do change their genders.
Also, since I only write in public threads, I guess I do discriminate against people who won't.