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.
Allie: So, how was your costume party last night?
Roger: It turned out to be a mandatory sex party.
Duncan: Those actually exist???
by Alliestalker October 15, 2009
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this is a simple phenomenon, basically just what the words say: it is a party where it is mandatory to have sex -- with allie brosh.

variations have arisen whereby whatever girl or guy that is named becomes (he or she) with whom sex must be had if you want the free drinks and food etc
dave: did you go to the party last night?

dale: i went to the house, but i got there and turns out it was a mandatory sex party and i didn't have any viagara and, you know, i can't naturally get it done with non-asians. allie said just an hour or so of oral would be ok but i was looking around at all the guys who'd already been there a while and had their turn and i kind of thought i'd be better off just going to a movie.
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dave: did you go to the karen's mandatory sex party last week?

dale: yeah. it was pretty fun.
by willhard9723 May 19, 2013
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A party where all of the attendees get laid/are offered/arranged a sexual intercourse.

Preferably known in advance and with a voluntary commitment to copulate if necessary on the basis of compulsory empathy
Sure world needs more mandatory sex partying. All those odd fish fucking each others brain out
by ulzha February 6, 2010
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"A party where once you walk in the door, you are obligated to have sex. I would think that these parties often disguise themselves as costume parties or birthday parties or baby showers but THEN as soon as they entice people in the door, they are all "guess what this actually is? It's a mandatory sex party, bitch!"
I went to Allie's blog expecting some kind of awesome party with lots of pie, but as soon as I got there everyone was like "guess what this actually is? It's a mandatory sex party, bitch!" and then the raping of my eyeballs with awesomeness commenced.
by Havoc8709 March 31, 2010
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Sex parties in which attendance is mandatory. Most frequently seen as part of a sex course or among couples who practice both swinging and S&M.
"Sorry Kelly, I can't make any prayer meetings this week. I have some mandatory sex parties to attend."
by adelaidepoet October 14, 2009
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When someone invites you to a birthday/frat/whatever-other- kind-of-party-you-can-think-of party and it turns out to be a sex party. If you refuse to participate, you will arrested. Hence the "mandatory".
Markus: Yo dude, how was that party you went to yesterday?

Ken: Dude, it turned out to be a mandatory sex party!

Markus: Oooohh! Dude you got BURNED! HAH! So did anyone get arrested?

Duncan: WTH!?!?!?! Those are real?!?!

Allie: Told ya so!
by Yourwordinformer January 24, 2011
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Any party that occurs after some sort of population-reducing apocalypse including, but not limited to, 2nd Ice Age, Zombie apocalypse, Nuclear war, or Donald Trump being elected President of the USA.
In this post-apocalyptic world any gathering of people, such as at a party, will be required to engage in coitus so as to re-populate the world, the only people being exempted are those who are already pregnant.
Allie: The apocalypse has left me with so little to wear to the party tonight!
Melissa: That's alright, it's going to be a mandatory sex party anyway!
by Monquiis November 26, 2010
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