Ofcourse, but he said 'want'. Want to me implies something that is not automatic. Or maybe i'm reading that wrong. And where is that 85% from? Must be per country because in some countries it must be far lower.

Sure it's not automatic, but as you can imagine there's an extreme selective pressure towards wanting children.

After all, all the people who didn't want kids, and had a choice about the matter died childless and never passed on their anti-replication genes.

Cool citation

He's not obligated to prove anything to you. If you don't believe him you can easily look up the stat yourself.

They literally just made up a random number

I'll source -- http://www.pewsocialtrends.org/2015/05/07/childlessness/

15% of women ages 40-44 in the USA have never given birth, from which we can pull 85% of women ages 40-44 have given birth, as of 2014.

Wow, I got it right to a percentage point? I didn't realize it was 40-44, so maybe it moves teensy bit with IVF past 44. Thanks a lot for the cite.

Source = Human Civilization?