Being with another person can mean lots of different things, obviously, so make sure you and your partner cover what is and isn’t OK. For example, maybe it’s OK for you to sleep with the other person but not to date them romantically, or maybe certain sexual acts are reserved for your partner. Rader suggests asking yourselves: “Do you want to only have threesomes? Do you want to only sleep with other people when your partner is out of town? How often can this happen? Do you tell your partner all the details?” You also might want to discuss boundaries around how frequently you can see the other person.