Backstory is friend and her husband have been together for 30ish years, they are both late 40s with 3 young children. Wife hasn't been interested in sex since first child was born roughly 11 years ago and think things have been a bit strained between them.
She's reasonably private only drops a few things into conversation about this here and there over the years. I've recently found out (not through friend herself) that she has said to her husband that she is fine with him sleeping with prostitutes.
He travels for work to a lot of UK cities for sales so assume this would be easy for him to do and not bring it to her doorstep.
I feel a bit strange about it, we spend a fair bit of time them as a couple and as families with young children, and i know her family very well and am friends with her brothers wife now knowing this information has made me look at them both a bit differently. Aibu?