i like it, either during a scene or just fooling around, but only a quick, attention-getting slap on the side of my face...to me it is just as stimulating and erotic as hair-pulling...it tells me 'don't forget who in in control here, so you'd better be a good girl'... i don't see the problem with it if it is not done in anger, and done for sexual expression. the ideal 'slap' would be where you are on your knees in front of him and Master grabs a good chunk of your hair and pulls it so that you face him, but, you, feeling a little spirited that day, might fight it a little bit and then he just sort of quickly smacks your face while talking to you, saying something like 'huh? are you listening, you little slut?', then grabbing your chin and making you kiss him like the slut that you are. yum.