Sleep around
Definition 1 of 1
Pro Tip 1/3Cultural Sensitivity
The phrase can be controversial and offensive, reflecting cultural attitudes towards sexual behavior. 
He got in trouble for implying that his colleague likes to sleep around.
Pro Tip 2/3Negative Connotation
Often implies judgment or disapproval and can be viewed as a negative or derogatory term. 
Despite the rumors that she likes to sleep around, she's very professional at work.
Pro Tip 3/3Informal Use
Appropriate for casual conversation, but too informal for professional or formal writing. 
In a friendly chat, he joked about his single years when he used to sleep around.