As Liadan brought up, our races are mammals because females have breasts. As was also pointed out, if you look very closely our characters, both male and female, do have nipples. If you're Miqo'te put on the hempen camise or the red summer taiga and trust me, you'll see them.
What we do not have (at least males don't) are areola, which are the discolored circles of tissue surrounding the nipple.
What we do not have (at least males don't) are areola, which are the discolored circles of tissue surrounding the nipple.