Why do men have nipples?

Or: "Why do men have (big pumped fat obscene looking) nipples?" Maybe a) to show them off on Datedick to all the other nipple horny men or b) to get them sucked and licked by two hot men because it produces sexual arousal or c) because Scientists have proven that with the right amount of stimulation on a man's mammary glands using hormones, it can actually cause male lactation