How Old to stop spanking Daughters?

[Batman]

As a spanker who as given discipline spankings to grown female friends on their bare bottoms without thinking a single sexual thought, I know I wouldn't have this type of thought towards my own daughter, sister, cousin or niece. Not everything involving nudity or the genital area has to be sexual in nature even when it involves people of the opposite sex.

However, you might run a test next time to see if the spankings are being sought by your daughters. Before they do something deserving of punishment, ask them each privately if they would prefer to be spanked or grounded as a means of being punished. You would probably have a better deterrent going with the opposite of their answer.