No need to get into weird arguments if we do not automatically think of anything that could be related to sex as "obscene". Nipples are erotic and can stimulate sexually, and not just female nipples. Still, that is no reason to censor them or to think it is obscene to show them

Mammary Glands were mainly evolved in Mammals as well as marsupials and monotremes as a means to supply the off-spring with the most nutritious foods possible by the easiest means possible, i.e. milk at a regulate consistency and temperature via ducts, etc, running through nipple like structures.
Yes, they are also attractive and very eye-catching BUT by no means are they obscene unless, imho, you are a 100% unadulterated Prude.

no that sounds about right though im more an ass and leg man myself.

Evolution doesn't care. Breast serve the purpose of making milk, ensuring the survival of babies. They also stimulate the males to be attracted to females ensuring that they have babies and make milk with the very same organs. In evolution the mammary tissue is an excellent example of multifunctional organs. Not exactly particularly sexy to be put this way but that is why they are so impressive to the male species. We are simply products of evolution as such we function as necessary to reproduce and procreate. Now I will try all this sexy talk with my wife and see how far it gets me.

they are for both. Women have milk let down related to oxytocin release after parturition. Breasts may be larger but they are not "engorged" unless lactation is involves

An ex of mine couldn't orgasm without sufficient nipple stimulation. They're not solely for sustenance.

You are not off... but Try the Multi Purpose Approach.

if they weren't meant for sex, why do they create pleasure? multi-function, i say. that said, wear clothes or don't. live and let live. i might take a second look if i saw someone with theirs out, but i at least learned not to stare, and so my day would continue on like nothing happened. penises too.

I think you're on the right track. Breasts are typically the most (visually) obvious secondary sex characteristic in humans. They're basically an advertisement that says "This is a (genetic) female.". Men tend to be highly attuned to both sexual cues and visual cues, so it's a double whammy. I don't think the initial, base fixation is on the breasts themselves; I think its more about femaleness in general--subconsciously, of course. All kinds of justifications arise when the forebrain gets involved.

Breasts are engorged while breast feeding as yes can get sensitive during sex. They rarely produce milk during sex. What else do you want to know?

I like breasts, I like the sight of breasts, I like the taste of breasts, I like the feel of breasts and I really don’t care if their primary function is the nurturing of babies. I also find no problem with appreciating a woman’s form clothed or not. I think that’s only natural.

My grandfather told me that men liked boobs because they never got over the urge to suckle. But its a really tough call. Nipple stimulation causes the uterus to contract which helps the uterus to shrink down after giving birth. However, it also is pleasurable. So, what about the men who like women's tushes? I think it comes down to that we are all sexual beings who are wired differently, we need to respect each other's space and rights, and for Zeus' sake let the moms feed their babies when and where it is needed without getting your shorts in a wad. We're grown ups, we should act like it.

Well in Brazil, where I was born and raised. I saw women breastfeeding their babies anywhere...park, bus, beach very common nothing sexual about it...they usually would put a small cover so baby could sleep not for modesty...so yes breast can be for both depending on situation...do you know why in 3rd world countries women breastfeed their babies as long as they can? That might be the only milk they can afford...