The victim had shared a taxi home with a man after going for dinner in a restaurant in Visby, Sweden, when she said she needed to use the toilet.
Believed to be in her thirties, the woman was then offered to use the one at her fellow passenger's home.
Her lawyer Staffan Fredriksson said: "She followed him in and had no fears that something would happen. Then the man took advantage of the situation. The abuse started in the toilet."
After launching into a savage sexual assault on the woman, several other men later joined in the abuse.
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