But people are more than 7" thick. It depends on how you interpret it I guess, I read it as moving 7" in any direction which means you’ll still overlap with your own body, but if you read it as there being a 7" gap between where you were and where you are now then it would work.
I’m 42 and uncircumcised, born and raised in America. My entire life the total sum of what it’s amounted to from locker rooms to relationships is pretty close to “huh, ok then”. I can’t promise it will be the same for your son but it’s been a total non-issue in my life.