This isn't entirely correct.  When you easily can retract the foreskin there are no worries doing it.  In fact, when little boys are sitting in the bath tub they shuld be encouraged to do it as far back as they can and "wiggle" their penis in the water to wash off urine residues and other "grit". No soap in this age!  So the correct term should be ...a young boys penis fully retracted which shouldnt be done FORCEFULLY. ...    Peace and all the best from Norway! :-)