Not all men are obsessed with breasts, but those who are (and those who aren't) like the way breasts look. They also like to touch them. It is an excitement for them.
The development of secondary sex characteristics (for example, breasts in females and facial hair in males) causes girls to look like women and boys to look like men.
Why do some men want to grow breasts like women
yes
Love it
Are you sure about this because a 13 year olds breasts would look like a womans breasts
Some men like it.
yes
because men like to screw them
people put tissue in their bra because it makes them look like they have bigger breasts and to attract men
Men like boobs because they are a distinct part of female anatomy.
Women do too. Eyes go to breasts.