@kagan I reject the entire premise of the question. Every serious relationship I've been in has been with ... other bisexuals. (There's one person from my teens that I'm not sure how they would identify now, but apart from that it's all of them). In my circles that is not unusual. Bisexuals date other bisexuals a lot.
If other people want to make assumptions based on the gender presentation of the folk I'm dating, then that is scarcely my problem.