how to respond to someone who asks you an inappropriate question for which you need not reply!
But perhaps a bit of education is in order for you (and if you care to share) those nosy girlfriends.
First of all, breast augmentation, augmentation mammoplasty, or the more colloquial "boob job" gives you natural breasts whose volume (size) is enlarged via implants, which can be of different types. The two main types are saline-filled silicone elastomer implants, and soft, cohesive (cannot "leak," sticks together like Jello) silicone gel. They come in smooth, textured, round, and shaped, in all different sizes. SIlicone implants come pre-filled; saline implants can be under or overfilled, and this changes how they feel, depending on how much of her own breast tissue a patient has to "conceal" her implants.
Implant choice is dependent upon surgeon and patient, and the best surgeons doing the best surgery obtain the best results, which are NOT "fake" at all--they are breasts enlarged so skillfully that (unless the patient wishes) they are virtually undetectable. And yes, they're soft and squishy. Or, perhaps somewhat round and firm. Like "real" breasts.
Because, of course, once you have examined a few thousand pairs of breasts, you quickly realize that they come in all sizes, shapes, softness or firmness, and textures (since about 50% of women have fibrocystic changes in their breasts).
Large(r) breasts in an otherwise slim young woman might inspire someone to suspect augmentation has been performed, but read the paragraph above again. You're just unique!
Remember to use the power of large breasts wisely! For more information click on the web reference below. Best wishes! Dr. Tholen