I didn't want to find out about either of mine and I don't think I could have felt any more bonded with my kids if I tried My kids get born into a gender-neutral kind of early childhood, anyway, so it makes no difference till they decide it does when they're more cognizant of the social differences. For DS it started last year. For DD, it hasn't hit yet, she just directs herself to what she wants to do with the available, non-directional toys here.
So, even if I'd found out, it wouldn't have helped me decide which activities they would do or what activities would help us bond. My kids are condemned to learning to swim and ride horses, no exceptions