I absolutely agree with most of the men answering this question. I have an incredible sexual and sensual response to having a woman pay attention to my nipples. As I have been told and noticed in my female partners, there are erogenous zones that we all have and I think if you define your zones, which may change priority on everything from time of the monthly cycle for women based on hormones, to environment (sensual, candle-light --- your brain is ready for sex!) to learned behaviors --- oh that felt good in the past, it will feel good now, and all the other multi-factoral reasons something feels good (new partner, new emphasis by old partner, etc), the snapshot in time defines our responses.
If you look across many threads here, we are asking very linear single topic questions in an attempt to understand ours, and others sexuality and sensuality. But it's much more complex than that. We all might agree that different stimuli at different times feel great, and not at other times. (A woman says -- "I was so turned on that you could have hit me over the head with a 2 x 4 and I would have cum too!) (I apologize in advance to those I am boring to tears) So, there are hard wired stimuli, and softer wired stimuli.
My hypothesis is hard wired stimuli feel good to almost everyone all the time, while soft wired stimuli vary from time, situation and learned response. For example: Most men and women would agree that rubbing a mans cock would cause a good sexual response, but the verdict varies (see below) on rubbing a man's nipples (and women's nipples). I am a hard wired nipple response male.
Any stimulation to my nipples (accidental/shirt rub/not gender specific)-- feels like sex, no, not just sex, sex now, again and again-- which can make me uncomfortable -- (just like "unwanted" attention can from some men to women)) or cause a dramatic focus on having sex and reaching an orgasm for me. In fact, rubbing, licking, light touch, more so than painful or firm contact, puts me into a mood to have sex, right now, with no delay.
I think this is like those uber sensitive areas women have that they just go wild when stimulated (and they vary from the classic and expected such as the g-spot or clitoris hard wire to the sublime and unexpected such as earlobes, wrists and behind the knees). I can reach nipple orgasm, and it's a full ejaculatory orgasm, stronger than penile stimulus effects.
I have been, it the past, a little apprehensive about the effects of nipple stim on me, because as some women and men might agree they have an erogenous zone that is so powerful that the stimulus of it leaves them nearly powerless to prevent orgasm or progression into sexual play, even when they might not want that attention. Any others wired this way? --- it's not an excuse for being irresponsible, it's a stimulus that is almost biologically impossible to ignore.
If a woman stimulates my nipples, I have to mate, and mate now..... period. Since I am not hetero flexible, if a man accidentally stimulated my nipples, I would go into fight or flight as an alternative behaviour to mating-- sound familiar girls?
So what's my point? We all have hard wire and soft wired responses. If you teach, or your lover takes the time to learn yours, then you will have gone a long way in befriending your mate sexually and sensually. You will also have communicated subliminally your willingness to put their pleasure ever so slightly in front of yours, and they will in turn reciprocate --- which may lead to an incredibly strong interpersonal bond between you and your partner. Just my 2 cents. I apologize for the length of my post.