A good rule of thumb is to have at least three different scents: one for work, one for casual events, and one for romantic occasions. If you have been using the same cologne for years, it's time for a change. If your sex life is boring and not much is happening, try to shake it up and use some different fragrances. Rotate among two to four and don't be predictable. Colognes are always great gifts for the holidays or any special occasion.