Y do men like boobs? I don't get why that is?

it's the mothering instinct or wanting to be mothered (coddled/hugged, told everything is ok, comforted). But it's also that men are allowed to look at bare boobs (and not allowed to look at asses) in public and boobs remind them of the buttox. It's said that men think about sex every few minutes of every hour.

because men secretly want boobs for themselves. freud called this "breast envy"

Because they don't have them like we have them. That's why I like boy parts.