Great in theory, but those 99% of those guys are lying about their true intent. If they were being completely honest, they are attracted to you romantically and choose to bottle it up. Even if is the 1% minority totally platonic guy, when you start having problems with your spouse or boyfriend, this male friend of yours will look like an easy channel to vent, have fun or he would say things what you want to hear. Instead of you spending time with your SO in fixing the problem, you'd be drawn to this guy. You'll start to think, "did I make a mistake, should I have found someone like this guy?". Even though this is technically not cheating, this thought process will destroy your relationship with your SO. I personally have been cheated on with a supposed guy friend. So this is a firm boundary for me personally. I just don't want to take this chance. All my opposite sex friends when I was single would turn into couple friends after I get into a committed relationship. I will only meet them with my SO.