Many healthy males get an errection every time they
ride the bus or train. As the
destination quickly approaches, it is normal for a male with an errection to experience sensations of fear and/or panic in foresight of being observed by others. This can cause the release of epinephrine into nervous system which can thicken the blood and cause an errect penis' blood flow to diminish, leaving him with a chub on. In some cases, a release of epinephrine can stimulate or excite a male further, causing the penis to become "harder". In this case, a male may
voluntarily skip their destination to allow the swelling to reduce, or they may tuck in their errect penis' into their pants' waste line to avoid other passengers suspicions'.