Five things to have before you go to a party:
1. The fee. Most parties require a small donation to the host. Find out beforehand how much and who to give it to, and in what form--some hosts prefer to receive it by PayPal, some want cash, and a few venues can even take credit cards. (Very few; if you don't know, assume cash.) This donation is just to cover use of the venue, equipment, and snacks; you're not paying for play and you're certainly not paying for sex.
2. A sexy but comfortable outfit. Elaborate fetishwear isn't necessary in most scenes (nightclub fetish nights tend to be dressier than play parties), but it's nice to dress up a little. A little black dress, a tight black t-shirt and well-fitted jeans, or your "night-on-the-town" shirt and a nice skirt or slacks will do fine most places.
3. Any toys you'd like to play with, and the necessary safer-sex supplies for any kind of sex you'd like to have. (Even if you bareback your partner at home, a lot of venues want you to use condoms/gloves/dental dams when you're there anyway.) You may not to get to use these if you're coming solo, but if you do, you'll be glad you weren't empty-handed.
Although some venues provide safer-sex supplies, it's a good idea to bring your own anyway just in case. It's also nice to bring a towel, small sheet, or even "puppy pad" or Chux if you're planning on sitting around naked or doing anything that might let off a few fluids. Your gracious host should not have to deal with your crotch-juice on their furniture.
4. Sobriety. Don't show up to a party drunk or high (and definitely don't get drunk or high while you're there). It's not safe to play under the influence and it's not socially acceptable to hang around a party smashed off your ass.
5. Managed expectations.
-You will get to socialize with lots of kinksters in a much more fun, relaxed, and flirty atmosphere than a munch.
-You will get to watch play. Probably some very cool and fascinating (and hot) play.
-There will be a bowl of M&Ms.
-If you came with a partner, you almost certainly will get the opportunity to play with each other. It may be a bit of a shuffle to get a good spot in the "dungeon" space if things are crowded, but it's usually not that hard. Ask a host if you're confused. Don't start whupping on each other in purely social space; no one wants a scene blocking the punchbowl or making a lot of noise and fuss on the chill-out couch.
-If you came alone, it's possible you'll find someone to play with. It's a toss-up. Depends on your social skills, depends on the crowd (some parties have a lot of pick-up play, some tend toward more prearranged scenes), depends on the whims of Fate. And depends whether you want to. If you're not comfortable playing, or if you get offers but they don't make you comfortable or aren't what you're looking for, it's perfectly okay to come to a party, socialize, watch some scenes, and go home.
-If you came alone, it's unlikely you'll get laid. As at any party, it could happen. But play parties are not orgies--a lot of people don't include sex in their play at all, or at least not casually. Some venues don't allow nudity or penetration. And even if you're surrounded by casual-fuckers in a sex-happy environment, I can't say if you'll get laid. Don't stake your enjoyment of the night on it. And certainly don't come to a party with the main intention of getting laid; not only will you likely be disappointed, but you'll miss out on enjoying everything else you could be experiencing at the party. Plus you'll be widely perceived as a total creeper.
Etiquette.
The etiquette at play parties is largely about consent. Someone being a kinkster, being at a party, or being identified as a sub/slave/bottom/slut/dom/etc. does not give you permission to do anything to them. Ask before you touch--any touch, not just sexy touch--and negotiate before you roleplay. Sometimes a scene may look like a free-for-all with a lot of people joining in, but this may be prearranged or the people may all know each other in a way you don't. Wait to be specifically invited.
The same rules apply to you. Anyone telling you that you "have" to call them by some exalted title or do something (even something innocuous like grabbing them a soda) for them is full of crap--you have the choice whether you'd like to do that or not. (Likewise anyone who wants to call you by some exalted title or do something for you.) Anyone touching you without asking is being rude, and anyone touching you sexually without asking is a fucking creep and you're within your rights to tell them to fuck off and immediately tell the host what they're doing.
Most parties will have quite a lot of people expressing non-heterosexual, non-cissexual, non-monogamous, generally non-inside-the-box sexuality in various ways. Be cool about it.
Ditto when you run into people practicing non-"glamorous" fetishes. There may be animal players, age players, people in diapers, people doing various forms of intentionally goofy-looking humiliation play, middle-aged men in somewhat unbecoming latex ballerina costumes. You don't have to be turned on by it to be cool about it.
Don't provide color commentary on scenes within earshot of the participants. It's okay to watch public-space scenes, and it's usually okay to have quiet conversation in the same room, but don't get distractingly loud and don't make any helpful "whoa, I think I can see her cervix" comments on the scenes.
Don't touch people's toys without their permission. Their toys may have been carefully cleaned, or recently made extremelyunclean, or carry special emotional significance, or just be none of your damn beeswax.
As with munches, You Don't Talk About Fight Club. Talking about where a party is, who hosts it, who was there, what happened there--all ways to get other people in all kinds of unpleasant trouble.
Put a towel or sheet between your naked butt and the furniture. If not for the furniture's sake, then for your butt's.
Chill out and have fun.
The operative word in "play party" is party. No matter how well the night goes for you, between 75 and 100% of your time will be spent hanging out and socializing with kinky folks. Enjoy it, learn from it, and just relax in it. Don't expect to get all your fantasies fulfilled your first time out and don't spend the party stressing about how "much" you're going to "get." Grab another handful of M&M's, find a comfy spot on the couch, watch that gorgeous suspension scene they're setting up, and ask the ballerina man what he thinks of this weather we've been having.
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