False. Sex/gender is determined at conception depending on an x or y chromosome. The development of niples is detectible sooner than development of genitals. Correlation not causation.
I think the reason men have nipples is because men have the ability to lactate like women do, but most cannot because of hormones and because their mammary glands are much smaller.
If adult men are lactating it's because of a huge hormonal imbalance that's usually the sign of cancer. Men have nipples because nipples develop before the genitals do, so both genders get born with them.
Comments