As humans, our tastes and behaviors tend to evolve over time. The same is true in a relationship. An open relationship may bloom in time from a monogamous one, or partners may enter into a new relationship and negotiate their being open. You can read more about polyamorous relationships, or relationships involving more than two partners, here. Whether it is having sex outside the relationship or inviting someone in, the boundaries in place are really up to the involved individuals.
Like a good Boy Scout, it’s important to always be prepared. If you do choose to keep an open door in your relationship it’s good you know what you are getting into, especially in terms of your safety. Each new partner you invite into your life has their own sexual history and could introduce new things you may not want to share. Here are a few other things you might want to bring up with your partner: