Um...vanity....nope. Not vanity in most cases. Adoption is NOT that easy. It costs FAR more than artificial insemination and if you go through your state foster care agency you can be rejected for a lot of dumb things that you have no control over...I knew a lady who got rejected because she had a barn with a loft, stairs in her house, and farm equipment! I have very steep stairs in my house...there's no way I would be approved. That and the fact I live on a mountain and you have to snowshoe to get to the house 3-6 months a year. It's truly not that simple to adopt. You don't wake up one day and go "I know, I'll rescue a drug addicted sexually abused child that's been bounced around the foster care system for 5-6 years and we'll all live happily ever after." It's not vanity (any definition of it) that causes women to want a child of their own, it's instinct and common sense...if a foster family can't handle a kid, how can a single woman handle a kid, plus work, plus therapy etc. But mostly it's instinct and a strong biological drive that makes women want to have a baby of their own...to experience pregnancy and breast feeding and all of those things...the things women who have children so often complain about, and things men can't do and therefore can't understand.