Answering for hubby...
He likes big tits, so needless to say he's VERY content with mine. He's always staring at them, appreciating them, and as I breastfeed him he always has the opportunity to get maximum enjoyment from them.
For him, they're more than just sexual-characteristics and since we got married, apart from porn-surfing (which is a hobby we enjoy together) I've never seen him eyeball another woman.
...However he does spend enough attention on my rack I have to keep an eye on him and make sure he doesn't walk into things when we're out. lol