Everyone knows the names of Calvin Klein's most famous perfumes for men. Responsible for some of the biggest selling men's fragrance products of all-time, Calvin Klein is known for its innovative and exciting scents, and pioneered the revolutionary idea of the unisex fragrance in the 1990s. Perhaps you have your own signature scent that you wear every day, or maybe you prefer to mix and match several of your favorite products, choosing your scent depending on the occasion, the day or your mood.