Why do women bend over/crouch down in pictures?

One of my jobs is performing as a character actor, so as a result I spend a lot of time taking pictures with people.

I've noticed over the years that women, not all but a lot, bend over or crouch down in pictures. Can any ladies explain to me why they personally do it or give insights as to why women do?
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I understand about the cleavage, but I don't think most women are thinking about that. Examples:


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In both of these, I understand the girls in the front, but there are ones on the sides who aren't even turning their cleavage to the camera. So are they just doing it because they've seen other girls do it? It is more of a lemming response?
Why do women bend over/crouch down in pictures?
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