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I'll second what Notts and PS said. As the sub, you have the right to talk to your dom about anything you are truly uncomfortable with. Ask him for a safe word so you can stop the slapping when you have reached your physical or emotional limit. Some days, that limit might be 1, and some days it might be 20.
A few other basic pointers on face-slapping: It should be done with an open hand (not a fist), against the cheek, and the dom should not be wearing any rings or anything else that could cut, snag, or poke the sub's face. If the sub has piercing jewelry in, s/he should probably take it out before being slapped. Bitch-slapping or back-and-forth slapping is probably asking for an injury--broken noses, broken or dislodged teeth, a damaged or dislocated jaw, and damage to the ear or eye are all very real risks of aggressive face-slapping. How many slaps your face can handle probably varies depending on 1) how easily you bruise and heal and 2) how heavy the slap is. But 10 heavy slaps strikes me as about the upper limit.
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