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health advisory Hospital Mens Health 2007-11-15 5:38:35

When they cant breast feed.

Answer:

Here is the full reason:

Mainly, guys have nipples because women have nipples. All embryos (the developing fetus) start out as female. Gender becomes determined around six weeks of development as a result of hormone "baths," triggered by the genetic character of the cells' chromosomes. So, the basic physiological structures are initially there, with the hormones released around the sixth week of development determining whether an embryo will develop female or male characteristics.

Nipples in men have no specific purpose, but can be very responsive to sexual stimulation. Nipples (in both men and women) are filled with many nerve endings and can be quite sensitive. They can be an erotic area (or erogenous zone) for both women and men and respond to sexual touch and stimulation. Breasts are one of the defining structures that identify all mammals in the animal kingdom, and nipples occur in both the female and male of the species. It is interesting that in the higher mammals more closely related to humans 鈥?bonobo apes, chimpanzees, and gorillas, for example 鈥?nipples are quite prominently developed in the male.

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Because, as I understand it, a zygote is essentially female but becomes a "male" in a later stage of fetal developement.

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Decoration.

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because they need them to shoot fire out of.

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Au contraire. Men can lactate just as well as women with the proper hormonal stimulant.

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to give you females something to suck besides our penis. lol.....JUST KIDDING

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god wanted them on his people

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def for decoration!

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i wonder that too. my boyfriend doesn't even let me touch his... so why?

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There's a book called "Why do men have nipples? Quetions you ask after the third martini" by these two guys. Go read it, it has more facts in it too, pretty funny and interesting.