We are programmed from our caveman ancestors to seek members of the opposite sex who appear well equipped to produce and sustain healthy offspring (so as to perpetuate our genes). Large, shapely breasts show that a woman will lactate well... simples!

Now that basic drive has morphed over the eons into a general desire for shapely partners and we are progammed from youth (and subconsciously) to value shape and symetry. Not surprising then that many men like big tits!

Yes, but what is it exactly that makes them so attractive??
If it was normal for women to be able to walk around topless in public like guys do, would they not be yummy then?

[deleted image]
These tits are a BIG deal...

I can only speak for myself but then there's the rub. It isn't something that can be explained. Like beauty, the excitement is in the eye of the beholder. As for me, when I see a well formed breast and I get excited. Not necessarily big, just well proportioned and with a pleasing shape. I love the look of firm nipples through a woman's shirt and the jiggle or bounce of a woman walking down a street is fantastic. I find really bib breasts less exciting than a flattish chested woman with great aureole and perky nipples. I also am fond of women with dark aureole, puffy nipples, and those with nearly non existent inverted nipples. It's a personal thing.

That's interesting. I'm a complete homosexual but the only "part" of a woman that I find interesting is her breasts. I think breasts are beautiful, like a sunset over the lake, or a great opera. I don't find anything about them even remotely arousing, but they are still beautiful.