What reason? Well, have you ever seen men's underwear lines bulging out of the tight clothing articles? You might have seen it on others.
Nuwear – Underwear News Briefs
How Do I Get My Tights To Not Have Underwear Lines on the Sides and the Back?
7 Things men Refuse to do – Mensuas
What's Hot? Agacio Temptation Thong – Skiviez
Men's Underwear - the premier underwear blog on the web
Some Tips To Prevent Your Underwear From Showing – Mensuas
How to Avoid the Most Common Underwear Mistakes
The Style-Conscious Man's Guide to Underwear
Nuwear – Underwear News Briefs