A man.
Santa Plause.
A lot!
A Womanizer.
A man who is sleeping with a lot of women can be a simultaneous dater. However, if a man is dating or married to another woman and is sleeping with a lot of women is a cheater. It's the same with women, if she sleeps with a lot of men. Also he can be called a manwhore or player.
She had a lot of affairs.
A philanderer is a married man who has affairs with women other than his wife.
A man who is a leader in national or international affairs.
The cast of A Day of a Man of Affairs - 1929 includes: Maury Holland Mell Ray Ginger Rogers
Astrology is the belief that heavenly bodies influence the affairs of people.
Rode
Covert Affairs - 2010 Man in the Middle 3-13 is rated/received certificates of: Netherlands:12