philander
verb (used without object)
(especially of a man) to have many casual sexual encounters or affairs, especially when married or in a committed relationship.
Used to describe an action that began in the past, has continued continuously, and is still in progress.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
May you not have been philandering a little also, Monsieur Bonacieux?
From The Three Musketeers by Alexandre Dumas père