If you are refering to breasts, then look at the question on this site "why don't my breasts grow" in order to find herbs to take, but up Saw palmenno to 3 times a day, instead of two times a day.
if you mean the nipples them selves, then look up nipple pumps. If nipple pumps are used and left on for an hour or two every day, then after about 5-7 months the nipples will be much larger and won't shink back down to size over time. Most men who do this have said theirs ends up on average around a mediumto small sized woman's nipples.
Also for about 10 hours after using the pump, they say their nipples will usualy stay at the size of a large woman's nipples, slowly receading back to the above stated size.
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If they use steriods for the wrong reason and are on them too long, then they will get breasts, but you don't want breasts because that would be wrong if you wanted them, but I think I know what you mean, you are only curious.
There's no such thing as male or female nipples ... nipples are nipples. The only difference is that females develop breast tissue under their nipples while men do not.