Just wanted to debunk a myth.
Men and women can be friends. Just had a really good convo with a long-time friend of the opposite sex. We periodically update each other on life, how my hubby/kids are doing, how his wife/family are doing. He's a really cool guy; he and I respect each other and there is none of that other stuff going on.
So, yes, it's possible to have friends of the opposite sex. Some of the friends I respect the most are of the opposite sex. It can be strictly friendship and very respectful.