I had three girlfriends for a while in my late twenties in that I was the guy they hooked up with when their primaries were out and they were feeling lonely / jealous. Not a great gig, as I was getting laid way less than I would have liked.
Curiously, my flat-mate’s boyfriend, who was getting plenty, was envious of my poly adventures, maybe imaging more of a harem lifestyle than I actually had.
PS: Only in my late forties did I ever become comfortable letting my parents get news about my love life, by which time it had stabilized.