Why do human males have nipples? (probably been asked, but can I be arsed to read 200 replies? Nope)
Because in the start of the development circle for humans, they are not defined as gender, and nipples are made. Then, the human embrion gets a gender but keeps the nipples if male. It's a relic of partially faulty growth circle.
Why do human males have nipples? (probably been asked, but can I be arsed to read 200 replies? Nope)
Not only do males have nipples, they have mammary glands as well, that can be activated and start to produce milk. Do you want the religious or scientific explanation?