My mother always whipped me, and was always bare-butt. Now, the whippings were always in private, however. Usually took place in the basement, bare butt, and with a strap or nice, green switches. The whipping was never just a few swats, it was always a genuine, welt-raising ordeal. I always appreciated the fact that it was not done in front of others, and did experience a few erections. She never mentioned the erections, and masturbation was generally indicated as a no-no. The interesting part of all this was, she either left me in the basement for a while by myself, or sent me to my room, by myself. I really think she knew about my masturbating, but seemed to never ask or interfere.
This was also the case with enemas, and I always wondered about where she was at, in that matter. I was never caught masturbating, but she had to have seen stains on my sheets, or underware. Also, wondered what went-on in the bathroom, while door was locked, when she took enemas?? My dad was a busy person, and he always left the whippings up to mom.