1.
You are mixing up 2 things. Getting desensitised to a woman's look is not the same as not finding her attractive. To a guy that sees a hot girl once every year, she will be something so special, that he will end up being afraid to approach her and be terrified by her beauty, where as someone who is always surrounded by hot girls grows accustomed to it, and approaching another hot girl will not seem intimidating as he has already learned that even they are only human.
You will see that as you get better and better at it, it becomes way less about the quantity of the girls, and way more about the quality.
2.
Well personally i think you SHOULDN'T consider every girl a romantic interest just based on her looks. Ok, the looks to tick their own box in the whole thing, but what if she is nuts (Some bitchez be crazy!

) Approach people mainly to get to know them, not just because you want to sleep with them. They are hardwired human responses, but you have to step out of the "caveman" mindset of just taking care of replication, and actually get to know the girl first, before giving her high value.
3.
Cool man, you're reading George Carlin

He was an awesome person. Totally agree, take everything (in life in general, but especially here) with a grain of salt. Find what works for you, not just what worked for others.
Take care
~TK