A man should never shave underneath his jaw if he wants a sexy beard.
The referenced video highlights a key grooming mistake men often make when trying to cultivate a beard: shaving underneath the jawline. Doing so, according to the video, makes a man "look a little bit stupid," which is not the intended outcome of grooming. The main reason for avoiding this is because it affects the overall shape and aesthetic of a properly grown beard. This area contributes significantly to the beard's volume and the creation of a strong, defined jawline (or the appearance of one). Removing this hair can weaken the visual impact of the beard and make it appear less impressive.
