Maybe I'm in the minority here but it's actually an intimacy thing that I appreciate. There aren't all that many people in my life who don't look at my bra size and go....what? But at the same time, this is my process. Because I learned to figure this out myself. If my partner told me I was wearing the wrong size bra...idk. I'd be pretty mad.

I can kind of think of it like any other strictly feminine thing. If I send him out to buy tampons and he comes back with the exact ones I want and another box of others because...I don't know, maybe someone told him they were new and cool, I'll probably give them a bash. If he just comes home with the new ones because he's now knowing more about what my vagina wants than I do....he'll get them thrown at him and I'll go out and fetch my own.

So I think it's one of those things where if you as a man want to be involved (and I'll tell you it's real nice having someone who DOESN'T buy you bras and tells you to sort your own out because they don't want to mess it up) then that's sweet. But...yes to the don't even hint at mansplaining. Not unless you have a PhD in bra fitting.