I am in a ethically non monogamous relationship (check out my partner JerseyGinger, she's really awesome). For us this means we are committed to each other but we date and have partners outside of our relationship. We are completely honest about these relationships so she will know about you and if you have a partner I would expect the same. You don't have to know each other but you will know ABOUT each other.
Additionally in the interest of efficiency I have 18 tattoos and counting. I don't mind talking about them but if I get one more "cool tatts, how many do [yo]u have?" message, I'll probably scream.