I didn't say it was. Law dictionary + wikipedia > thump though.
Unfortunately, that is not a widely recognized legal dictionary nor is it sufficient enough to reach your conclusion.
Just doing a basic Google search, I can find that California and several other jurisdictions require penis penetration.
Here is a legal article that discusses California laws and women, with a significant section on rape:
http://digitalcommons.law.ggu.edu/cgi/viewcontent.cgi?article=1409&context=ggulrev&sei-redir=1#search="California+Penal+Code,+Section+261+penis"
