Case # 3 — Going from upper single digit body fat to contest ready: This case is really what separates the men from the boys and the women from the girls. (hugorivera.net)
These attributes, I believe, are what separates the men from the boys, or if you like, the blues from the reds. (evertoniansclub.com)
Big penis dating separates the men from the boys. (myintimcity.com)