lecher; philanderer; womanizer
A somewhat literary or formal term for a man who habitually pursues women for sexual pleasure. Not a casual everyday word; more likely to appear in written descriptions or critical commentary.
In his youth, he was known as a womanizer.
その小説の主人公は、金持ちの漁色家だ。
The protagonist of that novel is a wealthy lecher.
Compound of 漁色 (ぎょしょく, 'pursuing women') and 家 (か, 'person'). 漁色 itself is a Sino-Japanese word meaning 'fishing for women', a metaphorical extension of 漁 (fishing).