Spanking is a sex act.
It has been for a very long time—probably even longer than it’s been a parenting choice.
A fresco at the Etruscan Tomb of the Whipping, which dates back to approximately 490 B.C., depicts an erotic spanking.
In Francum, a 1599 epigram by John Davies, includes one of the most explicit descriptions of sexual masochism in Renaissance poetry.
In Victorian England—well, there are way too many examples to list them all, so suffice it to say that spanking was a constant focus of Victorian erotica.
It’s weird that no one worries about the implications of hitting children on a body part that is culturally and biologically sexual.
If literature is any evidence, it was only in the past few centuries that people began to ritualistically strike the buttocks. Before that, we didn’t euphemize childhood beatings by isolating them to one specific body part.
It disturbs me that when I Google the word 'spanking', I find far more websites about sex than I do about parenting, yet most people still think the act is appropriate to inflict on children.
http://www.slate.com/articles/health_and_science/medical_examiner/2014/09/spanking_is_a_sex_act_which_is_why_it_should_not_be_used_for_punishing_children.html