The fact that when on a first date, a girl is less likely to sleep with someone she really likes and wants to see again and is more likely to sleep with someone who she never wants to date again. This can due to the belief that all her partner is looking for is sex, and once that is achieved he will move on. This can also be due to a woman having sexual drives but no one she is romantically interested in around, so she goes for an easy, convenient target.
"I held out on having sex with the sexy fireman after he took me on the best date ever because I really liked him and wanted to make sure we'd go out again - but I did sleep with my douche bag neighbor after a couple drinks because I realized I didn't care if we had another date. That's the first date fallacy for you."
by Ruby Solitaire June 22, 2012
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A test a man gives a woman on the first date by attempting to sleep with her. If he is successful she has failed the test and is too promiscuous to be considered girlfriend material.
James had a great time with Sarah on their date. However after they went back to her place and he gave her the first date test and she failed by allowing him to sleep with her he decided not to call her again.
by Pasadina Montgomery March 24, 2009
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Acting like you really like the other person but you really dont.
Kate: How did the date go last night?
Sarah: He seemed to like me, but i dont know if he was giving a first date front.
by Bucsfan411 January 24, 2010
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to kiss ur partner on the first date
Boy: Gimme sum sugar on the first date
Gurl: Who the hell are u?
Boy: Woot shes drunk!
by Sugar Daddy0088 October 27, 2008
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Coined by comedian Christopher Titus, first date arm occurs when a man is taking a girl on a first date. While his arm is on the armrest he will flex it as hard as he can. That way, just in case she brushes up against him, she will think "Oh my god, he's spun steel". The resulting tired arm is called, first date arm.
"Yo bro how'd that date go?"

"It was good man, but I got first date arm really bad."

"Sorry to hear it bro."
by phobes21 August 29, 2011
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Beyond the obvious literal meaning of the phrase related to anal sex, can be used to describe any situation where one party attempts to get something that would not necessarily be considered permanently off-limits, but would be considered completely inappropriate and out of bounds to request from a first meeting with another party. Especially fun when used in a business reporting context.
Businessman A: Wow you sure did get a lot of extra info about that deal proposal from your meeting at Company X, you must have a great rapport with them. Did you happen to ask them about the results of that other super-secret deal they did with Company Z?

Businessman B: No way dude, I don't go for anal on the first date.
by Grind S. December 18, 2013
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A joke that implies the person will attempt to have sex on the first date with whom they took on the date.
I told her "I fuck on the first date"
by Snicker Tits January 27, 2009
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