I think they already exist. China and a few other countries are keeping them under wraps until they can sell them at a realistic price.
A robot waifu that looks like a silicone sex doll would complete destroy the entire social interactions of the entire world overnight. They are more beautiful than essentially 99.9999% of meatbags but they have NO drawbacks or risks.
It's quite wild that if we manage to get the right connections with our chinese brothers, we might be able to buy one of these very exclusive perfect sex robots before everyone.
Holy shit...I would live with her for decades until the end of my life in a nice farm.