I joined KK in 2019 and have had a whale of a time. I'm 49. I've made lifelong friends on there, mainly platonic.
There's different elements. You can use it as a typical online dating site, searching for profiles you like and then sending a DM. I prefer to hang around in the chat groups and get to know people in a group setting first - there's lots to choose from including Women's Chat, Naughty Over 40s, Filthy Flirts, Kurious, and Kinky.
Because it is women-led, I find the guys on there much more respectful than FAB or similar. Bad behaviour in the groups is called out even by other men. They understand that women who have a lot of choice can afford to be selective and they'd better up their game accordingly!
There are regular workshops on anything from sensual dance, body confidence and jealousy, to pegging and massage.
Lots of informal socials for members throughout the country. You'll only here about these in the chat groups. I'm going bowling with 60 people in May, including a few I might invite back to my hotel!
You have to be approved to attend parties but this just means have your identification verified. There's no "beauty" standard or size restrictions. You just mustn't behave like a dick head!
Guys are not allowed to be unaccompanied at parties, they can only attend with a woman, so you don't get lone men wandering around with their cocks in their hand staring at you. If his date leaves, he has to leave too. There's no pressure to join in, you can just chat and watch everything unfold, have a drink or a dance. Obviously consent is paramount and is reinforced. There are hosts who keep an eye on proceedings and to whom you can report any concerns. I honestly feel safer at a KK party with 500 naked people than I do on the dance floor at my local nightclub.