One of my best and most favorite friends is Jennifer, who I have known for 20+ years. We talked about getting together back when we were both single but decided we didn't want to mess up a good thing. She's married and I hang out with her and her husband, who is also a great guy. But Jen will come down to spend the night at my house by herself and stays in the guest bedroom. We catch up, sometimes do shots and sometimes sing karaoke if the mood strikes. We have a blast. We flirt with each other but we both know it would never go further than that.

So yes... It IS possible!

Yes. I try to make sure my hair is neat, face clean, teeth brushed before I pop outside the house or apartment. If I'm in the middle of minor yard work or a project the clothes may be my work duds but if I'm really grungy I clean up before heading out. I do it for me.
I find around here at the apartment complex some do not feel the same. I want to yell "put your fucking teeth in you look like shit." I do not have dentures and I understand they are uncomfortable for some but geeezzzzz for the short time you are out in public it can't be that bad. smh

Depends on the person and the rules that are set up early in the relationship. I had many women friends due to my business but the trust between my wife and i was so strong that it never became a problem and they knew I was married.

I would qualify "something more" (other then "extremely attractive) is a requirement for a positive relationship.

Absolutely.
Looks fade over time....we take care of ourselves - for ourselves - not just to be thought of as attractive to others.
Even the hottest sex will slow down eventually. Hopefully, the companionship, the camaraderie, all the rest of it will provide a counterbalance to the sex. ????

What are you saying that good looking people are dumb, that all they have are their looks?

Why not?

Of course it's possible. For how long is the question.

That is the kind of relationship I want.

Yes, it is very possible. I have been married to two beautiful women (not at the same time), who were also intelligent, kind, and loving.