He might be clueless about this. One of my close friends in high school had strong body odor, but he was otherwise a really great guy. Finally, during a quiet moment of spring break week, I asked him when he had last showered. He turned red and admitted that it had been a week. "A week! Jesus, Dave!" (Tact was not my strong point back then.) The following year, he joined the National Guard, and they taught him all about basic hygiene. During college, our group of mutual friends also coached him on other basic etiquette like chewing with his mouth closed. He married a woman that he started dating in grad school and they are still together after nearly 20 years. My friend is now an assistant principal at a high school and also a Lieutenant Colonel in the National Guard Reserves.
Good decisions come from experience. Experience comes from bad decisions.