I am not sure how fat my husband would have to get before I noticed, and if I noticed, I'm not sure how fat I would think he was. Last year, my husband gained a lot of weight. I'm not exactly sure how much, but he was 6'5.5", 265 pounds. When we married, he weighed 25 pounds less. I'm not sure when he started to gain weight. We're nudists, so I usually see him naked. We snuggle a lot, so I should have felt a difference. We take long walks, and so I think I'd have noticed if he slowed down. I saw nothing.
His job depends upon his ability to maintain a healthy weight, and his maximum allowed weight is 237 pounds. So, I put him on a diet when he told me how much he weighed, and bought him P90X. At first, he was eating too much (that is my fault since I planned his meals according to the P90X books). Then, he was gaining muscle and water weight. So, I reduced his fats and carbs, and had him not do any resistance. He made weigh-ins a week late, but early enough to avoid a negative mark on his health record. He has continued his weight loss, wanting to get back to his boot camp weight. I'd like to see that too. His boot camp body was hot.
Then again, he's hot now. He's always been really sexy to me, from the moment I first laid eyes on his sweet, shy face. Last week, I uploaded a bunch of old photos onto Facebook. That's when I finally saw all the weight he'd gained. He was fat, but I never noticed. He was just my sexy man, and I loved him very much, and wished we were having more sex.
I was a lot fatter too for a while, which he also didn't seem to notice. (His mother did. Oh my God did she ever. Despite her own rapidly expanding hips and ass, flapping arms, and jiggling jowls, she pointed out my weight gain every chance she got.) I showed him the pictures, and he was as stunned as I was about seeing his weight difference. He said, "Wow. I know you said you lost 25 pounds, but you looked the same to me until I saw this picture. Good job, Honey."
If he became morbidly obese, I assume I would notice. But he's always going to have those pink cheeks, and gorgeous, chocolaty eyes, and frankly, I love a big body anyway. He's never had a small body. He is my husband, and I love him. If maintaining his health and our lifestyle became an issue, or if he asked for my help like he did when he needed to make weigh-ins, I would find a way to help get the weight off of him. But, he's my man, and he can't get rid of me that easily.