Sources on similar videos? Specifically:
>Crowd of people
>Nude amateur/professional (preferably amateur)
>Letting truly anonymous member of crowd lick/finger/fuck her, or her fondling/sucking them
It's supremely rare for all 3 points to be met, and it's super hot when they are. I know Vittoria Risi is a porn star that regularly does these things on stage.
Example of Vittoria Risi