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To engage in sexual intercourse with many different partners. Apparently they have an open relationship and don't mind when the other person sleeps around. I had a reputation for sleeping around in college, but they were just baseless rumors.
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.
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.