Use promiscuous to describe someone who has sex with many different partners.
Long ago promiscuous described a disorderly mixture of people and things. Today it is used as the opposite of monogamous to mean "with many different sexual partners." It is a disapproving term that can describe people or behavior. Sometimes you can use the word humorously. If you are culinarily promiscuous, you like different types of food. If something is not used selectively, it can be called promiscuous too like the promiscuous use of force.
