I think your arrangement is great. The only pitfall I see, since he doesn't want to know anything, is how to contain yourself if you become enamored with someone or are having such great sex that it distracts you and he can't help but notice. When I'm having good sex, sometimes I wonder if I'm floating off the ground, I get giddy and can't think of much else. So, just keep in mind that hubby will really need your attention when you are with him. It would be different if he wanted to know details, then you could just tell him about it. But I think it's great that you two could agree on something that meets both your needs.
Hot chick in the city.
Oh, oh, can't you see? Love is the drug for me.