A BRIDE mistakenly had sex with her new husband's groomsman after jumping in to the wrong bed. She then filed rape charges against him.

The groomsman, surnamed Ruan, was staying at the home of the bride, surnamed Huang, and the groom, surnamed Wu, after the couple ceremony in Napo County, Guangxi, on August 30.

Ms Huang went to an outhouse bathroom during the night and entered the wrong room on her return, the Global Times reports.

When she woke she realised what had happened and ran through the house yelling, "help! I've been raped."

After everyone gathered it was decided that the groomsman should pay the newlywed couple 20,000 yuan ($3500) but he refused saying he didn't feel that he was the one who was in the wrong and didn't have the money anyway.

The couple took the matter to police but a county-level court ruled that the groomsman was not guilty of rape.