All good points, Xin. From personal experience, I know are there those whose huge endowments are an embarrassment to them. Once I was in the sauna with a bunch of guys, most of them letting it all hang out, except the one dude with shorts on. After a while of chatting among the group, he joined in and he and I seemed to hit it off very well. (I had already noticed that his bulge indicated a big package)
To make a long story short, we went to his place, he excused himself to go undress in the bath room, telling me to make myself at home. Coming out covered with a towel, we proceeded to get personal. He was huge and apologized for his size, hoping I wouldn't mind.
They do exist, but hard for me to imagine.