This one-night stand happened between Ross Geller and Rachel Green sometime near the end of Season 7 and a month before the wedding of Monica Geller and Chandler Bing.
Ross and Rachel were writings out their vows together for Monica and Chandler's wedding.Then suddenly, a little later, they got drunk and suddenly got naked and had sex and ended up sleeping together. This one-night stand resulted in Rachel becoming pregnant with Ross's baby. This was Ross's's second child and Rachel's first. In the Season 8 finale, Rachel gave birth to her and Ross's daughter, Emma.
In "The One With The Videotape", it was revealed that the one-night stand had been caught on tape.
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