Unless you have a deformity, mastectomy or were born with little or no breasts, I think it's unwarranted. They don't look natural and they are screaming for more attention from men for SEX. Not because they have a nice personality or might be smart, but it is attracting men from their basest desires (which usually is the problem in the first place).
Then they wonder why they get treated as sex objects.
Just my opinion.

It's like men and hair transplants.
Most men would be better off shaving their heads.
However I digress.

When are the jean and underwear designers going to be adding stuffed cod pieces to men's clothing to catch up with womens' push up bras? And where are those cosmetic surgeons who will offer men silicone implants to (ahem) increase their penis size?
I think there's a big untapped market out there.