phi·lan·der 
(f
ĭ-l
ăn
d
ər)
intr.v. phi·lan·dered,
phi·lan·der·ing,
phi·lan·ders 1. To have a sexual affair with someone who is not one's spouse or partner. Used especially of a man.
2. To have many casual sexual affairs. Used especially of a man.
3. Archaic To flirt. Used especially 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- + anēr, andr-, man; see ner-2 in the Appendix of Indo-European roots.]
phi·lander·er n.