Honestly it's fine, i know a few men who actually like being called by what's generally defined as a "feminine" terms when intimate. Like "princess" and "wife". I see nothing wrong with it :/ (and yes these guys are mostly in qu*** relationships)
So all in all, whatever floats their boat haha maybe it's a kink or maybe cute petnames for one another, but hey, if they like it, they like it haha