sex accident 

any accident that happens during sex.

For example:
breaking a lamp
stubbing a toe
shooting a load into the eye.

sorry about the sex accident last night.

sex accident by DanteM August 29, 2005

sex accident 

Pregnancy

we had a sex accident now we have f**kin twins

sex accident by Captain Klamydia February 26, 2009

sex accident 

an unplanned for and undesired sexual act. usually proceeded by drug and/or alcohol consumption.

ew, you hooked up with him?
yeah, it was a sex accident.

i just wanted to go out with my friends but i ended up having a sex accident.

sex accident by hannah1357 February 24, 2008

sex accident 

something unplanned or unexpected occuring during sex

My parents had a sex accident resulting in my existence.

sex accident by unplannedparenthood March 27, 2009

accidental sex 

When you don't really realize what you are doing and have sex with someone but it was a total accident and you didn't mean for it to happen.

"The other night i took her home from a party because she was cold and i had accidental sex with her, because I was pissed at the girl i was wheeling"

accidental sex by Titty Tina September 26, 2012

accidental sex 

Having sex with someone when you honestly didn't intend to, or are trying not to. Not always a bad thing and is no big deal because 'hey, accidents happen'.

I went over to my ex's place to drop off some stuff last night. We got talking, one thing led to another and we had accidental sex.

accidental sex by urbanwordsmith June 14, 2008