I told the story of an incident a couple of years ago where I had to kick some single guys out of a bedroom Mrs. WS and another woman were playing in... It wasn't cool. The hostess backed me up completely even though one of them was her own brother.
At a house party about a year ago it was really early in the morning (or late in the evening depending on how you look at it

) Mrs. WS laid down on the couch in a part of the house the party wasn't happening in, when she opened her eyes there was a single guy standing above her with his dick hanging an inch from her lips. She was pissed! The host kicked him out.
The moral of the story, tell the host. Or if they have an open door policy that you don't like, don't frequent that club or those parties anymore.
Also makes a good case why single guys get such a bad rap, many not deserved.
Mr. WS