"What we're trying to do is to tell them how to do it in the nicest possible manner."

[...] The one-night-stand (ONS) is a bit like fast food: tempting, but with nauseating afterthoughts.

Make health and safety a priority. Always try to invite him back to yours, but if you insist on playing away, text a friend to inform them of your whereabouts.

Avoid dark-alley gropery, and unladylike fumbling in the back of a cab. Once home, leave him to select a CD from your collection while you embark on a turbo-tidy.

In the bedroom, forget about your normal night-time routine and leave pyjamas in their drawer. Discuss the necessaries to avoid planting any love children or disease, and you're away.

If you're at his, the ONS isn't over until the following morning's "walk of shame" home in last night's outfit.

Steel yourself and hold your head up high.

At yours, offer him breakfast and (assuming you want no more of him) say that your mother is on her way round. [...]

That's from Guy Adams' Independent UK article "Girls' guide to a one-night stand" on an updated Debrett's etiquette guide.