In September, the Bulgari Hotel in London launched a menu of new men’s-only grooming treatments. The Gentlemen’s Grooming at Bulgari Spa services range from shaving and barbering to face and body treatments. Appointments take place within a private, wood-paneled room equipped with a sleek black-leather Belmont barber’s chair. The 150-minute Gentlemen’s Signature Experience (from $345) follows a haircut and wet shave with a visit to Bulgari’s Habannosommelier, the cigar expert at the hotel’s Edward Sahakian Cig…