There is a practicality to these decisions. Even here at the sweat, I dread too many men in the ratio. It is unnerving for a woman to show up amongst a bunch of guys time after time. For a single woman not used to, or new to, social nudity, alone with guys can be discomforting. Although some women like that, the vibe and culture is more appealing, if women are present. I always try to have a woman around, generally that is DF. Girls bond. They don't need men so much, they are probably looking for a man less than men are looking for partners, especially the older ones. They tend to come around, check it out and then don't comeback, when there isn't a gal to bond with.
There is now an additional factor in the naturist communities, and that is LGBQ issues, extra and hyper sensitive women with the "me to" leanings. These people may have, in time, a beneficial effect on the gender mix at clubs. They are less threatening, and people tend to get out of the gender, man/woman pair bond, things and become more individualistic and less their sexual selves. The group tends more to arrive individually as people looking for friends to treat a group as friends. If you can use imagination in the scenarios, you might understand the point that I'm trying, and probably failing miserably to express. I'm not saying that it it threatens the Man/woman bonds, I'm saying that that stuff tends to be set aside. This suspicion is based only on my personal experience. It's not a researched opinion.
There are few couples that come to the sweat together. We never know who will walk in the doors. The mix varies and it being a basically spiritual health thing, it has many functions like a church, the gender mix matters less. The sweat isn't a pickup venue, you can get dismissed for that. We had problems with predatory behaviors back at the old sweat. It gives us something in common besides nudity, where at a nudist club many that you meet may have only the nudism in life as a commonality and you have to find your tribe based on more than standing around naked with each other.
The question of what we want comes to my mind.We here want a free society and acceptance. The issue we are discussing here, clubs, is caused by sick social constraints in concern of nudity and a host of other issues. There is the need for a safe place to be nude with others, instead of the freedom to just be who we are naturally with people as they come along. We can expect the institution of social nudity clubs to be flawed because they exist in, and exist because of, a flawed society. Basically, it ain't the club owner's fault, but an owner's poor response to lots of social BS.
I do hate, resent, and guffa at, gender bias and discrimination and sexism. I get kicked out of the sweat each month because I have the wrong genitals during the women's sweat. I sit in the house like a leper, until they have their girlish fun. It is nearly all learned behavior. They don't have to act differently with a male present, but hey, they have fun and it probably can encourage some to come around to the mixed gender sweats.
Jbee