Wisdom teeth, additionally, might serve whatever purpose they used to (adults would have lost many of their teeth before the days of tooth brushing, and wisdom teeth would have kicked in to help), but these days, they’ve become more of an obsolete pain than anything else. And finally, Dorsa addressed male nipples, which are not quite vestigial but are technically non-functional. 

It may come as a surprise to you that men have nipples because of embryonic development. In other words, the gender of a fetus could go either way in its early days in the womb and fetuses essentially start out as female. Eventually, testosterone kicks in and causes a fetus to become either male or female. This is why some men have been known to lactate, and why breast cancer is a possibility among males.

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