At the age of 24 I began to ask my doctors if I could be sterilized. Year after year at my annual exam I would state my case -- each year unchanged from the previous year. At each visit my physician told me that I was too young, what if I changed my mind? But the reality was that I didn't change my mind.
To those who believe that there is an inverse relationship between parenting and happiness, there is the parallel finding that these “parents find caring for their children to be much more exhausting than the work they do for pay.” So we are enriched by our kids, but all that enrichment can be tiring? Makes sense to me.