You do understand that it was not a documentary, but in fact a work of fiction written by men? Of course it panders to male fantasies tha women who reject advances are deserving of rape and that these women will in fact enjoy the rape once it has occurred. Also, these women are the property of their jock boyfriends, so raping them punishes the jocks, too. All of this feeds in to the ‘nice guy’ myth that they are owed being fucked.
If Lewis had loved Betty he wouldn’t have raped her.
I canola hope that you regret that pun.
Did you read the linked article? Betty is not portrayed as possessing any human agency: she doesn’t find a new love because she doesn’t choose anything: she is claimed as a trophy. Which you make explicit in your post above when you say Lewis takes his revenge by emasculating his rival: none of this is about what the woman wants, and romance is portrayed solely as a dick-waving competition between two rival men.
While it doesn’t help the very serious problem here is one way to think about it.
Apparently I am a lot sexier than Harrison Ford’s characters because apparently he can’t manage to get the attention of a woman without force. 
Indiana Jones, Deckard, Han Solo…seriously wtf? Spielberg will redo a movie to change guns into walkie talkies but the rapeish bits are OK?
Screw the Bechtel test, apparently we need a consensual sex test to even get close to needing the Bechtel.
You are absolutely right! We should all just accept rape culture and all the other ills in the world! We should all just give up!
Back To The OP
Haven’t seen it in a while. I don’t recall if the camera in the sorority house included a microphone. In some states at the time, that would have been necessary for a wiretap charge. As for dressing in Stan’s costume. I agree it’s rape. And Lewis knows it. He puts on that mask because he knows Betty will not have sex with him otherwise. The pie tins violate privacy, and I seem to recall the Tri Lambs sold them to a few minors too.