They have been for quite some time: Cosmetic Surgery.
I remember watching a TV show years ago about a woman who had had lots of plastic surgery, found the man of her dreams, and was now pregnant. She was afraid the baby would come out looking totally different than she did, because she had physically changed herself so much, and her husband would leave her over the deceit.
At the same time, with cosmetic surgery, you are changing physical reality. Someone has sliced up your body and reconfigured it to be more what you want.
So it's not necessarily a "lie", as such.
Like I said, though, I see what you're getting at, and it's a valid point.
I remember watching a TV show years ago about a woman who had had lots of plastic surgery, found the man of her dreams, and was now pregnant. She was afraid the baby would come out looking totally different than she did, because she had physically changed herself so much, and her husband would leave her over the deceit.