Bro your hypothesis is "I feel like it" and your evidence is "You can't prove it's not true" and that's just not how science works.
What we have is evidence (see your damn link to wikipedia) in non-human primates and the "I'm making a sound now to indicate that you should ejaculated for maximum likelihood of impregnation" is pretty solid stuff. There's talk of encouraging fights for better mate selection. What there isn't is talk of "I am doing a sex, please join the train being run on me" no matter how much you feel like it's a valid theory.
I'm not reading your thesis on cave woman gang bangs. Hopefully someone else will engage you on this topic further.
Eta; And lemme just say, the idea that "more evidence should be gathered" demands that you need to specify exactly how you want to gather said evidence. Which requires treating human women as animals to be studied. It's absolutely ridiculous at best and psycho at worst.