Why do men have nipples?

TheAlphaWolf

Males have nipples because nipples develop before male hormones kick in. When the hormones (testosterone... probably some others) kick in, the testicles drop, a penis develops, etc. Dec 24 04, 7:53 PM

peasypod

TAW is on the mark. After conception the developing embryo follows a female template. It is only after 6-8 weeks that the effect of a gene on the Y chromosome kicks in for boy embryos. This gene stimulates the production and influence of hormones such as testosterone which 'masculinise' the embryo by altering physical development to form male features. Nipples are formed very early in the embryo, before this masculinisation process takes place, and nothing that goes on later in fetal development reverses nipple formation. Dec 25 04, 5:47 AM

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Why do breasts have nipples? Why do males have nipples? Why do guys have nipples? Why haven't men lost their nipples through evolution and why do we have them in the first place?

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