A lot of guitarists are more concerned with music and the guitar gear and pay little to no attention to all the goodies that they could get along the way if they play the game right. You can rock out to Rush or Megadeth with your bros, but don't expect to get it from the fairer gender.
John is showing the young bucks how to effectively play the game, if they're willing to lower their musical standards a bit, and I hope they pay attention.
"I've loved seven other women and all were you"
That's some next level player shit! To us men, this sentence doesn't make sense, as we all know damn well that seven different women cannot be like one single woman. He's informing his gal of interest that he got it from seven other women, but wait.... he didn't cheat on her once, because all these women were only her. Sounds asinine, but if you're a guitar player, you can use even the most asinine statements to keep that "animal shelter" going, as Trev put it above.
John is not only teaching how to fish, he's putting that fishing rod (no pun intended) - angleworm included! - squarely in each guitarist's hands!