With the male of the species their nipples are completely useless and serve no function. I have named mine 'Thoughts & Prayers'......
men's nipples are much more sensitive than women. get a women to kiss them and you will have a use then.they might not do a lot but how strange would you look without them?
Certainly, males do not produce milk. But are nipples useless? For many men I have known the nipples are a particularly sensitive erogenous zone. It is not true for everyone but a great number of guys like to have their nipples sucked or otherwise stimulated bringing them great pleasure. Without being too clinical some like it gentle while others want it rough.