Phi·lan·der  (f-lndr)
intr.v. phi·lan·dered, phi·lan·der·ing, phi·lan·ders
1. To carry on a sexual affair, especially an extramarital affair, with a woman one cannot or does not intend to marry. Used of a man.
2. To engage in many love affairs, especially with a frivolous or casual attitude. Used of a man.
[From philander, lover, from Philander, former literary name for a lover, from Greek philandros, loving or fond of men : phil-, philo-, philo- + anr, andr-, man; see ner-2 in Indo-European roots.]