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It's common that human females have a more flexible body than males, (but I don't know why, so it'd be helpful if someone answers why so as well!) but does this apply to all mammals?

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Try birthing a child for once. You need to be flexible to accommodate the growth of another organism inside you.

Take a look at some pictures of the mothers spine during the course of a pregnancy, you will have no further questions. Same with belly size, breast size and vagina size upon birth.

This video is a nice explanation of this. Also includes the different centers of gravity for males and females (human).

http://www.youtube.com/watch?v=WO8DtsZO1nA

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