Authentitity
To verify if breasts are free of surgical corrections/enhancements would be to establish the breasts have authentitity. Implants or breast augmentation would render the owner to not have authentitities.
College fraternities often give out free breast exams to college co-eds to help determine authentitity! Its important to determine authentitity prior to engaging into intercourse (not really its just nice to know because she is probably sluttier). After feeling under her shirt while making out Philip could tell April's boobs where authentit.