Mmmhhh.... I think it is about how the girl who got the implants feels. It's a matter of self esteem. If she is not happy, she can't make feel fine anyone... So, take it as a therapeutic resource. Besides, women along the history have wear rings around the neck, strangled their feet, and even now they pierce the navel and/or the clit! Just because they want to be "pretty"... So, what do you want? To have a "natural", unhappy girlfriend, or a "prosthetic" but happy woman?
My 2 cents.