I think sometimes there are these ideas about what a relationship SHOULD look like in order to be "healthy," but really? I don't think anyone can say what is healthy for another person's relationship, y'know?
I think that if you and your partner are comfortable with this arrangement then right on. I do it a lot with my partner, too. Not about everything, but about going out and with different people, sure. It's not like if he ever said NO YOU CANNOT DO THAT ROAR that it would necessarily be end of story, but I like to ask a lot of the time because we can have a discussion about it. I especially do this when I am going out with people that could possibly end up being sexual partners (we have an open relationship.) I'll almost always say "I'm going to get together with this girl, is that cool?"
At the end of the day I'll do what I want, even if that means going against his preference. I have the right to do what I desire, although I also understand that my actions have consequences that I have to deal with. However, out of respect for my partner I ask his "permission," which is really more like asking his opinion. Even though I make my own choices, his opinion matters to me and can influence my decision because he's important to me. If I can see it's bothering him that I'm going out to a party with friends - for whatever reason he really seems to want my company on a particular - I will stay. Or sometimes I can tell he's just feeling a little insecure and doesn't want me to go out with someone if it means possibly having sex. In those cases I respect his feelings pretty much 98% of the time and just cancel the date. Sex isn't worth causing him anxiety of getting down on himself.
tl;dr Yeah, I'll ask for his opinion to go out with friends, go out on dates, things like that. Ultimately it's my decision but how he feels matters to me and can influence my decision.