Just found out that there is an actual condition where both men and women can produce breast milk without pregnancy, its called galactorrhea.
Its really insteresting to note the even males have mammary glands, but their development is supressed by the production of testosterone so they remain vestigial. However in cetain rare cases, when there's a hormone disbalance and an oversecretion of prolactin hormone, even males can produce milk.
Very interesting.