To accomodate their girth? personally I have been with a man 10 x 7 1/2 and the 10 wasn't as much of a challenge as the 7 1/2 circumference. I met a man that was 8 1/2 x 8, according to him.. My mouth felt like it was cramping, and i couldn't get him down. It looked like a longer can of beer, and his dick head was even bigger. He said his wife hated giving head, and I wondered how she even got it in her mouth at all. Of course he never had it deepthroated. Maybe when a man is that thick, it's a curse more than a blessing for him. He had several kids, so I don't think his wife had a problem there. I prefer about 7 1/2 x 6 1/2, but as long as a man is not too thick, there are sure a lot of guys with a beutiful 6 x 5 1/2.