I believe it is free to get in if you are a woman.
No pressure to participate espcially if nothing else is going on. Please realize that it may be absolutly dead when you walk in. Or a guy may be giving a BJ to another guy thru a glory hole. or something maybe happening on the exam table or the couch. Or 5 guys maybe scatered around the theatre chairs while some others are standing near the booths.
Expect to be followed around by horny guys waiting for some kind of signal from you. You may or may not be approached. Probably not.
Most are respectful...the owners will also look out for your safety. If someone gets out of line, all you have to do is go to the counter and tell the clerk. Or the other guys may step in to help you.