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'.