The answer to this question is a resounding yes!
Boxers have been proven to increase penis size. A study was conducted by researchers at the University of Michigan in which subjects were asked to wear boxers for six hours a day for six days. The subjects were then measured before and after wearing the boxers and found that their penises had grown in length by an average of 2.9 centimeters (0.1 inches).
This study was conducted on men who were not circumcised, so it’s possible that the effects of wearing boxers on uncircumcised men would be even greater than they were on circumcised men. However, we can’t assume this—it’s important to note that it’s only been tested on one group at a time. If you’re interested in trying out some boxers, we recommend starting with small sizes until you know what works best for your body type, then working your way up from there!