MY EXPERENCES
one night as my wufe and i climbed in bed she said that i should have my bottom smacked so i said be my guest/ i was nude and rolled over the next thing i felt was a hairbrush heating me up.it was fun and we ended up having a real wonderful climax together.
http://www.youtube.com/watch?v=lbh0jlB0Bis
*swoon*
Apparently this is normal, but personally I don't derive any satisfaction from this sort of thing. Somehow being striked on my bottom isn't really too appealing..
I think it has something to do with the contact on a private area. Kind of like being rough in bed, it's more expressive of sexual intent and therefore a turn on.