Day in which every waking minute is spent enjoying coitus. Used most often by desperate couples seeking to have a child.
Jane: I'm ovulating, so I need to take a day off for a Sex Day with John.
John: I'm getting laid consistently for 24 hours.
by Pete Cooter December 15, 2005
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1. The second day of school when you turn everything everyone says into something perverted.
Dude 1: *eats a brownie* god this things hard
Dude 2: HA HA HA HA EWWWWWWW!!!!
Dude 1: ...pervert...*eats brownie*

Dude 1: *walking in the rain* i'm soaking wet...
Dude 2: EWWWWWWWWWWW ^_^ ha ha ha
Dude 1: ...perv...
by Cazzie and Erin August 14, 2005
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No sex day- usually celebrated on the 3rd of october, everybody participating refrains from any sexual activity until midnight 3rd of October
Hey Jenny, you realise its no sex day today right?
by Goggler201926 October 2, 2019
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June 9
The day in which couples (gay or straight) celebrate sex by having sex. The reason National Sex Day is on June 9th is because 6/9 closely resembles the popular sex position 69.
Honey, today is National Sex Day! Let's fuck!!!
by E-Dog1209 June 10, 2015
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The Comedien Jim Jefferies came up with this. It is April 18th. Everyone else saying it's a differnet day should have to take it up the ass for every single other day on the calander other than the one they incorrectly mentioned as anal sex day.
“Wouldn’t it be nice to have one day that was for men that didn’t cost anything, that everyone could participate in. April 18th, Anal Sex Day. Everyone’s girlfriend or wife has to take it in the ass on April 18th. A month before you’ll be walking around the shopping center saying, ‘Ohh the decorations are up!’ And it’s good because if your bird didn’t take it in the ass, you could do the same thing that women do on Valentine’s Day when they don’t get a gift. You’d go like, ‘Oh me mate Jason and his wife took it in the ass twice. Obviously they’re more connected than we are.”

-Jim Jefferies
by LiamTW March 31, 2021
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On August 21st, we celebrate International Sex Day. This holiday originally thought up by Canadiens got a following after being mentioned on Gossipbees, a Los Angeles based gossip webpage. It basically is a day that encourage people to have sex, any and all kinds of sex, as long as its intercourse. Of course it HAS to be concential.
Its my birthday today!!!

Oh yeah. Why, its August 21, the International Sex Day. Let me give you your holiday present.
by COCKDiesel August 21, 2009
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