Why men's panties are sold in boxes?

If you ever buy underwear then you must see men's underwear on sale in the box or bundle. While women's underwear is lined up without a bundle.

Turns out it was intentionally done because of the nature of the man who bit shy when dealing with underwear.

While women are usually more thorough in buying clothes both cloth and color. It is rather difficult if the women's underwear is inserted into the package because it will hamper the women in choosing various colors.
Other than that in terms of marketing. Men tend to buy things according to their needs. So if d packs of men are forced to buy underwear more than one in a bundle. While women tend to buy based on likes and will buy as much as they like.