Ya never know. Cebulski has noted DoX has lots of romance and the talk about exploring X-Men style love does imply some new directions.
It's not a foreign concept. Deadpool & Shiklah had an overt open marriage where they had free pass lists of people they could sleep with. SO it's not as though the books haven't done it before. Then there was Psylocke having a gang-bang with Cable clones. Not too much of a leap in terms of the X-books' history.