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1. Men develop nipples in utero

If you want to know why both men and women have nipples, you have to go all the way back to the first few weeks after conception. Nipple development starts about one week before sexual differentiation occurs in embryos. Once the hormone testosterone and the Y chromosome in a male embryo trigger the growth of a penis and testicles, the nipples have already developed, and men are stuck with them for life.

2. Men can lactate

If a male takes enough female hormones, there is a very slim chance that their existing breast tissue could convert to lactating tissue and produce breast milk. However, spontaneous lactation in males who are not taking hormonal supplements should never be taken lightly. It could be a sign of a serious underlying hormonal imbalance or even cancer.

3. Men can enjoy nipple stimulation, too

Contrary to popular belief, men’s nips aren’t just there for pec-oration. Both men and women have the same bundle of nerves in their nipples, so they are often just as sensitive as women’s. Nipple stimulation causes the body to release oxytocin, a pleasure hormone, and some say it’s even possible for men to achieve a nipple orgasm.