Porn has set unrealistic expections for us. The issue with paying pros are that safe sex is paramount and the constan changing of rubbers do not facilitate an orgy. They will spend more time changing condoms then DATY each other.
I suggest you find a fuck buddy who is bisexual or bicurious friends, then hiring pros.
Alternatively you can always befriend some lesbians and ask to join in again fanciful for the mere mortal!