a one night stand is a one off sexual encounter between people. Many will defend the act stating that 'they knew the person' or that they were dating them, and after the encounter decided that they should part ways. Simply, if you had a sexual encounter on just one occassion with a person (no matter how long you have known them) then it is a ONE NIGHT STAND.

A sexual encounter with somebody you have no intention of seeing or even contacting again. An individual encounter with somebody who is, or becomes 'just,' a friend doesn't count - that is a friendship-with-benefits - nor in my view does one where you decide afterwards not to pursue the relationship, because you get cold feet or you may not like the other person's attitude afterwards (the latter sadly much commoner among women given men's often more exploitative approach). Those for me count as abortive or truncated affairs. A one-night stand involves meeting, sexing, parting knowing full well all along that you won't want to know the other person afterwards.

A sexual encounter with somebody you have no intention of seeing or even contacting again. An individual encounter with somebody who is, or becomes 'just,' a friend doesn't count - that is a friendship-with-benefits - nor in my view does one where you decide afterwards not to pursue the relationship, because you get cold feet or you may not like the other person's attitude afterwards (the latter sadly much commoner among women given men's often more exploitative approach). Those for me count as abortive or truncated affairs. A one-night stand involves meeting, sexing, parting knowing full well all along that you won't want to know the other person afterwards.

Not knowing the name of the person you wake up with probably fits.

meet someone you want to have sex with have sex with them leave WITHOUT getting their phone number never see each other again

You met someone and remember having sex with them the same night you met them and you don't even know their name or address.

I guess it would be this

Leaving your shoes on for sex.

I have never had one, BUT Chelsea Handler explains it here..... lol http://www.youtube.com/watch?v=qXnshSMrb68

No implications.

"a single sexual encounter between individuals, where neither individual has any immediate intention or expectation of establishing a long-term sexual or romantic relationship." "Individuals participating in a one-night stand typically have not known each other long and have had minimal time to get to know each other before engaging in sexual activity. A one-night sexual encounter is not necessarily always a one-night stand; the crucial distinction is the expectation or intention that the relationship will not necessarily be extended beyond the initial sexual encounter. A one-night stand is differentiated from prostitution, as it takes place without direct payment of money and from a casual relationship, which may not initially involve sex and may continue long-term. A one-night stand can be thought of as an irregular and unplanned sexual encounter between individuals. The participants will usually have little or no contact with one another aside from sex. Thus it is possible to have multiple one-night stands with the same person, provided that there is no regularity to the encounters or planning involved in the encounters. However, where the people involved have a regular sexual relationship without romantic involvement, this is generally considered a casual relationship (also referred to using terms such as "no strings attached"/and he loves "friends with benefits"/FWB), and is generally considered distinct from the one-night stand phenomenon. The risks of participating in one-night stands can include the risks of having unprotected sex, such as unwanted pregnancy or contraction of STDs. Effective use of contraceptive devices can help combat STDs. Researchers have found that women's feelings after one night stands are much more negative than men's. Feeling 'used' was the predominent negative emotion they felt the next morning and they also worried about their reputations and felt as if they had let themselves down. Professor Anne Campbell from Durham University said "What the women seemed to object to was not the briefness of the encounter but the fact that the man did not seem to appreciate her. The women thought this lack of gratitude implied that she did this with anybody." " Source and further information: http://en.wikipedia.org/wiki/One_night_stand

A piece of furniture placed next to the bed

A ant and an elephant share a night of romance. The next morning the ant wakes up and the elephant is dead. "Shit!" says the ant. "One night of passion and I will spend the rest of my life digging a grave!"