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sleep around (with someone)
Inf. to have sex with several partners over time; to be promiscuous. They say she sleeps around with just anybody all the time. Yes, she sleeps around.
to have sex with a lot of different people Just because I'm an actor doesn't mean I sleep around.
Engage in sex promiscuously, as in Fortunately, no one mentioned that both of them had slept around in their younger days . [Colloquial; 1920s]
1. To be sexually active with more than one partner: I'm surprised they're getting married, considering how much they both sleep around.
2. sleep around on To be sexually unfaithful to someone: I am certain my spouse is sleeping around on me.