The phrase "sleep around" is generally used to describe someone who has multiple sexual partners or engages in promiscuous behavior. However, there are numerous synonyms for this phrase that can be used to describe such behavior. Some of these synonyms include "play the field," "fool around," "have affairs," "be unfaithful," "cheat," "stray," "philander," and "commit adultery." While these words may have slightly different connotations, they all refer to the act of being sexually active with multiple partners, often without commitment or loyalty. As with any language, the use of such words should be used with caution and respect for others.