how many of you ever experianced having the slipper or cane across the bare bottom or have seen it administered. I am talking as used on children not

Yes, both slipper and cane (at different times) across my bare bottom when I was a teenager, either off my parents or friends' parents.

At school I got slippered or caned though my knickers usually. The exceptions were bare bottom slipperings in the gym changing room and, in 6th form, through trousers.