Single girl in the private club

This summer I often went to a naturist private room complete with a spa.
Last time, a few days ago, my attention went to a not beautiful, offline girl who was alone.
Usually the people who frequent this place are heterosexual couples and male singles.
She was among the first to go to the private room with windows with a guy found there and they had oral sex (she to him and he to her) and ended with a classic penetration.
I was intrigued and wanted to ask if she was alone and she confirmed it.
He told me it doesn't happen often, but he has seen others as well.
Then she can always refuse the advances of some man.
We went to the sauna together completely naked.