text: can wearing briefs make your penis curve? i just want to know because i've been wearing briefs all my life, 16 years, and it curves down. would this have been the briefs or is it just natural? there are many causes for penis curvature.  these include weak and poor development of the penis, wearing restrictive underwear, a penis injury or some form of damage to the penis, age, over-masturbation resulting in trauma to the penis causing scar tissue to form and thus causing the penis to gradually curve, twist, or bend.  other results include the penis being out of shape or deformed, such as one part being thicker or thinner than another part.  a slight curve such as to only 15 degrees, however, is normal.