Homophobes. Your nipples prove that you could have been Gay.

[Anymouse]

This does not explain my lesbian sister, though. Her nipples should be functional despite her gayness.

And for that matter, milk production is not a function of sex. Nipples function on demand, which causes the pituitary gland, not the female organs, to produce prolactin. That hormone is responsible for the production of milk.

Males can produce milk, just as a never-pregnant female can, simply by demand.

http://web.archive.org/web/2004061218334...00634.html is an archived article of a man in Sri Lanka documented to have breastfed his daughter. There are other such instances available on the Web.