] Pain hurts less when it is inflicted by a woman,
] researchers have found.
]
] Students were asked to put their fingers in a clamp which
] was tightened until the pain was unbearable.
]
] Researchers from the University of Westminster found that
] people allowed women to turn the clamp much further than
] men.

I guess female Dom's are preferable.

BBC NEWS | Health | Pain from a woman will hurt less