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It's been proven that men are attracted to women with wider hips. It's ingrained into our DNA. The wider hips are is tied to a greater propensity to birth children successfully; and since the goal for men is to ensure his genes continue on, those hips are like a a giant pick her sign. Men are naturally biased towards this, but oh god is it awesome. Pic related.
Seeing as how we're also very visual, compared to women, the mons pubis is at ground zero for what all men want and seeing it gets us into the mood, just like nearly everything else on a woman does.