Some women seem to be spanked with a baseball bat in "Tonnel's no minasan no okage desita 2 hours special"(lit. Thanks to everyone by Tunnels).
I found the movie uploaded on youtube or sth alike, but it is too long to find spanking scenes...
Based on Twitter's posts,i guess after 1:16:00...
http://www.miomio.tv/watch/cc241171/