I was pointing out the flaws in your advice before she decided to try it. I was not "mean" about it. I was honest. And I quoted different parts of your post to explain why I didn't agree with that particular piece.
I've been in a relationship for
almost nine years. The reason we've been together so long is because we're learned how to communicate. If I can show others how to communicate, the chances their relationships will last are greater.
Your advice centered around her using her body to keep her man. I said she's worth more than that. If that angers you off, so be it. There are better ways to make a relationship work than using sex and jealousy. If you have to resort to those, your relationship is already doomed.