Thanks for the tips on setting boundaries as well. I put my foot down about her receiving calls from him at home. One time in the dining room, she picked up the phone and it was him. I gave her a stern look and said, "Do not disrespect this household by taking that call." She said he was only asking about their assignment. She tried taking the call outside but I told her to hang up. I then looked up his number and texted him, "Leave my wife and family alone." I don't know if she knew I did this but she apologized the next morning.
As for the marital bed, there's a kink in our living arrangement. We don't own our home but live in one of the houses that my father-in-law owns. Plus her sister and her family live with us (it's a 7 bedroom house) on the weekdays and they go home on the weekends (they live far from where they work). My father-in-law has a room here as well and spends a lot of time here.