philander

(verb) have amorous affairs; of men. Synonyms: womanize, womanise. Example: "He has been womanizing for years."

(verb) talk or behave amorously, without serious intentions. Synonyms: chat up, flirt, dally, butterfly, coquet, coquette, romance, mash. Examples: "The guys always try to chat up the new secretaries." "My husband never flirts with other women."