I have had this very talk before in previous relationshps. Part of even being in a place you a\re willing to start down this path is accepting the consequences of you wanting her as a famle and wife to disregard a very important thing to a women that also keeps any marriage healthy... you both are secure and satisfied with the sexual ability to satisfy her which is also tied to many other dimentions and feelings in how a relationship grows, survives, and gives the feeling of excitement for the future.
You letting that role and part of yourself and what it provides to her and your relationship forever changes how and what she feels about you as her husband and the reasons and benefits of staying in a relationship with you.
I may ask them to pause things for a bit to work out an issue that came up but atleast my own experiences have been by the time you start its too late to go back for either of you and really be happy together knowing neither of you are satisfying your sexual needs completly, however those are different based on husband/wife and individually..
My ex-wife warned me she was scared of admitting to herself and to me where it might lead for her to really like it and want it all the time alot and deal safely whereever her desires may take her and us...all my partners who started entered into this lifestyle had to rationalize and remind themselves which malles they wouldnt respond to their advances and why they had to reject thiem no matter if noramly single they wiould be interested since its now a completely new and unfamiliar situation they have never been in any relationship.
