I've seen many reports from bros reporting about working girls with C and D cups calling their boobs real.
It cringes me how easily women deceive guys with their fake breasts.
Breasts implants have come a long way and these days you can't make out weather the breasts are real or not just by touching as these days the implants are placed behind the breast tissue and on some occasions behind the pectoral muscle as explained in this diagram:
http://www.justbreastimplants.com/placement/
Here are some clues to identify fake boobs

:
Borderline: Unless they're sitting in one hell of a push-up bra, natural breasts don't have a defined, 360-degree border around the edges. When looking at the right breast, it should only have a border from about four o'clock to eight o'clock.
Gap: Oversize implants can create a wide, bony gap between breasts. "Many surgeons mistakenly put in bigger implants to mask the gap, and it makes it look worse," Teitelbaum explains.
Fall line: When a woman lies on her back, her natural breasts fall slightly to either side. Very large implants, on the other hand, stick up straight.
Side line: When viewed from the side, natural breasts tend to have more volume in their lower half (you can thank gravity for that). Fake breasts often look as full on top as on the bottom.
Pointers: Most nipples point straight ahead or slightly up—but if an implant is too big, it could make the nipples tip downward.
And remember if you see a Chinese with a C cup or above, 99% it's fake!
