Oh it’s pretty common.

Men usually ensnare women for sex. Some men target high society rich women for life style as well as sex. Several men with a lot of influence have harems of many women primarily for sexual as well as emotional needs.

Seducers all over the world are famous for it. Many Don Juan’s and Casanova’s do it for ego satisfaction and sexual pleasures.

I personally know many guys with multiple girlfriends at a given time. They sort of have one real girl friend and several backup options.