Originally Posted by Emm
Do they know that you want more than just sex with them? It may be that the agreements they have made with each other allow sex but not love - or something like that. If that is so they also need to make it clear to you so that you can decide if that is the sort of relationship you want to be in.
Are they new to this type of relationship?
Agreed. Some people have not even considered that they could be married and have other serious romantic relationship at the same time. Some people don't want that. They just want NSA threesomes. Have you discussed who wants what?