No breast milk for adults!
It's not just a matter of morality. Milk (esp. cow's: humans love them for some reason) is very unsuitable for adults' health.
It might be the case for you - but not for all adults.
Most mammals develop a lactose intolerance when they're weaned. A lot of humans, particularly caucasians, have evolved to still be able to properly digest milk. SO your generalisation is incorrect.
Brian McNeil / talk