I think that ended for me 24 years ago, when I got married.
:-)
Seriously, the "should or should not" allows one to look at others and admire God's handiwork. It merely suggest one should not reduce the judgment of that handiwork to the mere objectified public proclamation of your desire to have "relations" with that handiwork.
A concept that unfortunately has not gained much traction in the past 500 comments :-)
I think that the blurring of the distinction between simple admiration and a "desire to have 'relations' with that handiwork" is much more of a male weakness than a female one, IMO. Which is why I can't think of a single time when I've seen a female FReeper use that phrase when speaking of the handsomeness of a particular man.