"If you had the ability to create a lifelike female, why would you make her 11 years old?"
Japanese scientists apparently have had the same idea. They created a robot that looks and moves like an adult woman. Apparently it's not quite ready for Prime Time yet, though:
"Repliee Q1 can interact with people. It can respond to people touching it. It's very satisfying, although we obviously have a long way to go yet."