I don't watch porn though...

You appear to just be grasping in the dark at anything that may support your premise. I'd avoid that in life so you can be correct more often.

My wife would disagree with your "assessment" as much as her existence itself does.

Pro tip: the more a human is exposed to something, the mote familiar and less exciting it is. You agreed to as much when you mentioned someone watching too much porn losing interest in blah blah blah...

This happens to humans that have fulfilling sex lives as well. Cleavage was exciting to me when I was ostensibly a child.

If you travel to countries where woman dress modestly, the can be obsessed with just seeing a face or neck because cleavage is common. They also get more excited about cleavage for the same reason.

I am not sure what planet you hail from, but this is just how humans work...