I have come across an interesting aspect of a culture in the past which I would like to share.

One culture as that of the Karamojong of northeastern Uganda has been a practice of ritualistic penis stretching. Beginning at puberty, a Karamojong boy hangs circular stone disks from the tip of his penis. When he becomes accustomed to the pain, more disks are added. His penis swings like a pendulum. By the time he's a teenager, he may carry as much as 20 pounds from his penis, which could measure 18 inches or longer.

However, if I am not wrong such a practice is now far less common.

There are quite a few cultures in the world that place prestige over this apparent thing of equating a larger penis size as desirable. And thus in terms of cultural relativism I see that this is something that maybe many of us can relate to as a reason for why it is being done.

The problem many of us might have would be as to why such “extreme” measures need to be taken, which brings in the issue of moral relativism. But then again we should probably be less quick to judge as their social context might place a far greater emphasize on the size which we are unable to fathom.

One possible explanation i could give would be that as women have a far lower status than men in this society, a greater manhood could mean greater standing over his wife. Similarly it could also increase his social standing among his male peers. However, it is after all also an age old tradition passed on for many generations as with the traditions of other many other tribes. Thus it really could be the result of a combination of many factors from both the past and present.

You can read this article, the penis stretching tradition is not practiced anymore
It is also interesting to note how people get their information on the internet and believe what they read, leading to them trying to "practice" the same ritual to stretch their penis-full explanation in linked article.