Okay, and I'm going to be as honest as I can and as blunt as I feel is necessary to answer the question... all the while trying to be respectful. This is not an answer for all men but from I think a good cross section of us.
Women have boobs. They range in size from nubs to mountains and everywhere in between. Guys like, or should I say adore women and their boobs... no, not just their boobs, but yeah, boobs are an especially nice add on 😜. We, or at least most of us know not to stare, but if a woman has an attractive (to us) figure and the boobs are there (not hidden by clothing so as to virtually disappear) then we will at least look. Sorry, we will, like it or not, we will. Yes, it should not be a tongue hanging out, drooling ogle, but we are going to glance at them and sort of "size them up". You know, evaluate on a scale of 1 to 10 on how they look to us (we each have our own scale, which is a whole other story). Sorry, you asked, and we will, deal with it. If we didn't, we wouldn't be interested and in that case, it doesn't matter anyway. And, if you... how do I say this? Hmmmm... if you have them rather prominently displayed, then the quick glance may not be quite as quick and it may repeat itself. Again, we are guys, deal with it. Generally speaking, if it's a first date, we will be quick and and peek when you aren't looking... at least mostly. If it's a second date, you might notice. If it's a third date, you will know we are looking... we want you to know we are looking and want to see what the reaction is. Ifit isn't a date, but a friend thing only, then if we happen to glance at them, it's a guy thing and we honestly can't help it. Tell us to stop and we can both laugh at us (the guy) being a guy.
If it really bothers you that we look at all... well, it is really doing to be awkward for you and guys in general. Honestly, we aren't always undressing you with our eyes. We are just enjoying what the creator put before us.
I do respect you and women in general... I do, but all said and done, I'm a male of the species. I have issues.