The Mandatory Sex Party is a socially radical minor political party founded in October 2009, in the back woods of Montana. The Party's federal chairpersun is Allie Brosh. To date they have no elected members but momentum behind the MSParty is growing.

The MSParty believes in prosperity through population, coining the slogan, "Breeders are Leaders". In a political climate where many governments are contemplating the challenge of stemming population growth, the MSP takes the stance that population growth will provide the global community with the next generation of scientists, doctors, philosophers and theologians necessary to save the planet. They believe that population suppression risks the prevention of our future leaders being born.

The MSP launched a modest election campaign for November 8, 2011 cantered in Montana, with candidates also campaigning across Wyoming, North and South Dakota. A primary campaign tool being utilised by the MSP in this election race are 'mandatory sex parties'. The MSP, with its many policies supporting family growth, are encouraging supporters to throw pre election mandatory sex parties in the anticipation of having many blossoming families behind their podiums come November 8. Founding member Allie Brosh has been quoted on-line saying that the Party believes in growing their support across generations.
MSP supporter -I'm throwing a pre-election mandatory sex party this weekend, are you going to be coming?

MSP supporter's associate -I don't really know, I guess I've been thinking of looking into it, their policies and motivations seem sound. Who else is coming?

MSP supporter -Well we're quite excited, Allie Brosh is going to be there to give some motivational foreplay.

MSP supporter's associate -So the sex is really mandatory then?

MSP supporter -Yeah, hence the mandatory. Did I mention Allie Brosh is going to be there..?
by ShastaBare August 5, 2011
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A party that is disguised as a typical type of party, but really requires you to have sex throughout the night; Obligated sex with multiple people; Raping is involved. The Amazing Allie from Hyperboleandahalf.com coined this phrase.
Guy 1: Jill invited me to her Halloween Party. You goin?
Guy 2: Nah, the only type of party she has are "mandatory sex parties"
by Mandatory sex party goer January 27, 2011
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A sex party. Probably like a swingers party, except you don't KNOW that that's what it is until you get there. And, you know, once you get there it's kind of... well... mandatory, to have sex. Because of the mandatoriness of the sex party. And if you don't, then they... you know... rape you. =/
Julie: "This should be fun. I love costume parties."
*walks into party*
Nadab: "Guess what this ACTUALLY is? It's a mandatory sex party, bitch!"
by AhAhChristina December 8, 2010
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A mandatory party in which upon arrival everyone must have sex immediately. Occasionally thrown to as a pre-test to the completion of a Sex Education course.
Bob: Hey Kelly it's nearly the end of the semester! Are you going to the Mandatory Sex Party tonight.
Kelly: Well it IS required for a passing grade.
Bob: Sweet! I'll definitely see you there. *creepy wink*
by Terry Burnettersumthing August 26, 2010
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See Mandatory Sex Party, with zombies. A mandatory sex party is like a normal sex party, except if you don't attend you get arrested. People are told they will be attending a costume party, but what really happens is a wild, out-of-control orgy involving beer, fire, and moving logs onto the road. This one just has zombies.
by Rabid Tiki God September 26, 2010
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