philander
verb
phi·lan·der
fə-ˈlan-dər
philandered; philandering
fə-ˈlan-d(ə-)riŋ
: to have casual or illicit sex with a person or with many people
especially
: to be sexually unfaithful to one's spouse
—usually used of a man
… her philandering brother-in-law; and … the schoolteacher he philanders with. —Judith Crist
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Merriam-Webster unabridged
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