Erotic sensibility of the nipple is mediated by a deep branch of the nerve that comes out from under the 4th rib. When we do gland resection, it is guaranteed that this nerve will be cut--there's not really any way to do the procedure without doing it. This issue was first brought to my attention many years ago by a patient who explained that he had such sensitivity pre-op, but after the surgery, although he was able to feel his nipples, he no longer had erotic sensibility. I discuss this with all of my patients, and it's rare that any of them opt for liposuction only, but it does happen on occasion. Most recently, the patient involved didn't really require gland excision, so he should have a good aesthetic outcome while hopefully preserving the erotic sensation. If, on the other hand, you have significant glandular tissue, you may find that liposuction alone will not provide complete resolution of your gynecomastia. You and your surgeon should discuss this pre-operatively, so that you can decide if it's more important to have complete removal of the gynecomastia, or if you'd rather use an approach that might protect that sensibility.
Good luck,
Rick Silverman