From my point of view male nipples are of not any practical use
at all? (Aside, that is, from providing a convenient place to hang
nipple rings?) compare to female species which they needed them to
nurse.
And far from being passive participants, nipples usually swell and
get erect somewhere on the road to orgasm or due to different
climate.
So end of the day, see no harm of having a nipple on a guy in
general.
