Riding no hands. Who does it and why?

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I've never been able to, though I often have wished I could. I've come closest since switching to deeply curved SMP saddles, but still feel like I'm going to pitch forward over the handlebars. Perhaps men's pelvises are shaped differently enough to make it easier for them?

THIS! Also, I have a pretty severe case of spinal lordosis, so even standing my entire pelvis is sorta pitched forward (it's a BIG reason I love my SMPs -- everything else was like a torture rack to some degree. I no longer draw blood on rides).