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1.
Receptacle "receive back,"

In Zoology
*an organ or structure that receives a secretion, eggs, sperm cells, etc.

Common use
* women that receive secretions, spermatozoa, etc. without requiring a condom.
'left me a voice message. "Next time you use me as a cum receptacle, please..."
by SuraScent April 12, 2007
 
2.
An old word used to describe a sex-only relationship. "Receptacle" was made popular by a handsome young Physician character on the 80s television drama St. Elsewhere. The young Doctor said: "I'm not looking for a relationship, I'm looking for a receptacle." For the era, this was quite shocking. President Reagan was in office at the time.
Modern example: "Dude, I just can't handle a relationship that requires meaningful social interaction. I only need a receptacle to ejaculate my goo into."
by Rook's Buddy May 10, 2010
 
3.
When a man has sex with someone, man or woman, with whom he regards only as a thing to have sex with an nothing more, he or she is a receptacle.

A catcher for whom the pitcher holds no emotional signifigance
Homo Joe likes illegal immigrants off the pier...his last receptacle got deported.
by Exilechamp1 April 18, 2004