I dunno--I'd sure like to think that it was not.
Conduct your own experiment, it's easy and harmless enough. Next time you're waiting in a public place and watching the folks walk by on the street, at the mall--
Check out the guys checking out the gals. You'll find perfectly normal, average guys checking out girls twelve--thirteen...if you asked them why they do it..."I dunno."
Maybe it's hardwired? Maybe it's just a part of nature to rise above, just to avoid jail.
As the father of a 16 yo girl, I know of what you speak. Over the years, when she is with me I've not noticed it so much, but when she is with my wife the "men" don't even try to hide the fact that they are ogling a child.
The thing is, so many men do not realize the prison of lust they are in, imo.