Boy/boy, girl/girl, or boy/girl??

I am 9 weeks pregnant w/ twins, and I am so excited to find out what I am having!! We want a boy and a girl, but we will be happy no matter what we just want healthy babies!! Out of curiosity, how uncommon is it to have a boy and a girl twins? They are fraternal, which means they are in separate sacs. I would think... show more I am 9 weeks pregnant w/ twins, and I am so excited to find out what I am having!! We want a boy and a girl, but we will be happy no matter what we just want healthy babies!! Out of curiosity, how uncommon is it to have a boy and a girl twins? They are fraternal, which means they are in separate sacs. I would think it would be more common to have girl/girl or boy/boy based on the travel rate of sperm (male sperm don't live but 48 hours but are faster, female live longer but are slower), so you would think if one male sperm got there the other is probably a male too?? I'm not sure, so what do you all think??

:o)
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