I think you overestimate the standards of swingers, who often are not especially attractive, but will groom themselves to seem more attractive than they are when they're hitting on people outside their circle.

Granted, you have to be attractive to get into Hollywood swinging parties, and especially rich swingers will look for less-rich young hot people to populate their swinging parties (usually with a personal interest in having a chance to smash that) but for the rest of ~~us~~ ~~them~~ ~~us~~ them, they want to to look slightly better than the Elephant Man, but do come clean, relatively well groomed (mind your nails, please) and if you can afford to dress nice, please do so. (No one denied access due to lack of funds.)

Far more important than being good looking in the alt-sex communities I've experienced has been attitude and personality. This is one place that my own vampiric obsession with consent has really served me well.

Swinging parties on cruises may be different. There is absolutely a phenomenon in which poor, antisocial behavior that parallels aristocratic problems, becomes distressingly common on cruises. (Note, I've never been on a cruise, but have affluent parents who do, and can be snobbish themselves. From what I've read about cruise experiences, they sound dreadful in their opulence, hazards and wastefulness during a global pollution crisis) But then, cruises are expensive, and so the Venn diagram of obnoxious cruise passengers and affluent folk who are obnoxious off-cruise as well has a large area of intersection.