I know a friend who exactly having this mindset,
Allowing his wife to enjoy to hav fun, he told her just b responsible n discreet, dont get pregnant n disease,
N keep him informed if she wants to go out with anyone or even vacation away, not to stalk or keep track, just want to know her whereabout in case something bad happen,
Thats some heavy shit there, not every wife can handle that much freedom, n not every man has the heart strong enuff to accept that,
He told me she handled the trust given quite well, always asked her husbands permission if she can hav her fun time, n last time I met him he told me she still hadnt fucked other men yet, some fondling dancing n giving BJ only
I thought he was mad but hey whatever got his mojo going...
Anyway for TS, if this is what u choose to go for, just understand that this can go beyond cuckolding, she may hav attachment to one of the men shes seeing