No one is attracted to genitalia, really. People are attracted to people, and part of trans liberation is ending the surprise at a partner’s genitalia not being what’s “expected” by getting rid of the expectation entirely. Anyone for whom not having the “expected” genitalia is a dealbreaker even if they were getting on just fine beforehand is most likely a transphobe. In a world without coercive sex assignment at birth there will be no “asking the question” because there will be no question; society will not place the same emphasis on what’s between your legs that it does now.