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A lot more relationships are headed that way. Unfortunately, most societies have an unwritten moral code that frowns upon it. Finding the right partner who is open to polyamory is the first step. Even if they aren't doing it themselves but have given you permission, takes a lot of unnecessary lying out of the relationship. Sadly we have been conditioned away from natural, instinctive behaviour, in order to conform.

Good point. They're pretty popular indeed, especially if it's plainly labelled as "friends with benefits."

Some people just don't go for that though. They want the commitment. Ironically, they end up cheating themselves.