First of all it seems to me that this guy was just a liar.

If you can keep a "secret life" from someone that you live with then you are a pretty accomplished liar.

There are a few subs that I would drop it all for. That I as a bisexual switch would pick a gender and a role for and just be with them. I would use them like a rented Sherpa for sure but they would be my one and only.

If i was to have multiples I still wouldn't call it polyamorous. Amorous implies love. I usually only love one person at a time. Playing with other people is not a big deal for me. I can take it or leave it. I think of it the same way i think about vanilla threesomes; they're better when with people you wont ever see again.

So i guess in short the answer is no not every Dom has multiple slaves. I will if it's an online thing. I really want to rent out a sub in some sort of sex party and push those limits of monogamy that some of them have (and for other perverted reasons) but I personally don't need more than ONE GOOD sub. I certainly wouldn't have real feelings for more than one and effectively if it was a switch sub I'd let her Dom any other sub after her.

Anyway i would also like to say... welcome to the lifestyle not all of us are liars.