I am in my mid 30's, married and one of my closest friends is a man I met though work about 10 years ago. He is also married, back when we met we were both unmarried as yet but with our current partners.
If we have admitted had we been single we probably would have got together but we both agree it was better that we were not as we would make a horrible romantic / life partnership. We had a great time together in our 20's clubbing, staying up all night talking, getting up to all kinds of crazy stuff. We slept in the same bed a couple of times but nothing ever happened between us, not even a kiss.
I am sure his wife and my husband had their concerns at the start about what was going on but they are used to us now. I love him to bits and I feel we are proof that men and women can be friends, even best friends without sex getting in the way. However you I think it can't ever be the same as being friends with a woman.
My number one thing is that while its ok for either of us to have a bit of a gripe and grumble about our spouses to each other from time to time but its best we don't really talk too much in that way and to avoid doing it at the same time as that sort of creates a little oasis with just us two outside either of our marriages and thats dangerous. The closest we ever came to having "romantic" type feelings for each other was early on in our friendship when we were both fighting with our partners and talking about it too each other.
What are you golden rules of maintaining a close platonic freindship with a member of the opposite sex without it developing into anything more?