generally have an overwhelming ratio of men to women, and the women are either pro's that are going to be charging for their services or ugly civvie women that can't get a date in real life. If they charge an admission AND admission is by couples only, you will have a reasonably good chance of fucking someone decent. If you get there and the girl you brought is the best looking in the room, chances are SHE will have plenty of options, but the women other guys brought may not be nearly up to your standard, even for a quasi-free fuck.
I don't go to these because when I did over 10 years ago, they turned out to be a total scam and waste of my time, mostly "Delta Mu" sorority girls or 100 guys and ten girls. One of my friends who is bi-sexual still goes to these because if there aren't enough hot women to go around, he will proposition a hot male. If you can't get a guarantee that there will be about the same number of women as men, you may find yourself in the same boat. It's like a pot luck dinner. There may be plenty of stuff to pick from, but most if it looks so bad you don't want to try it.
With that said, if they have photos of previous events they have put on that shows that the women are not all cows, it might be worth a try, those are going to be few and far between. Most successful sex parties are couples only. I have gone to some of these with a FWB girl I hook up with from time to time, and they can be quite enjoyable. Usually in a private residence, and there may be an admission charge to cover food and alcohol.
The other questions I asked all go to separating a legit event from a scam. Get as many answered as you can by someone you trust before you sign on. That's my advice.
