Is it truly ok with you?

In a relationship, when does it become it OK to flirt with others or to jump in bed with others with your significant other knowing? Is it truly OK with you? I know some women are open and honest with wanting their husbands happy, so if having sexual intimacy with others makes him happy then that is fine. That alone triggers my curiosity even more :) To each their own 🐸🍵 I would just like to know from YOUR perspective.