After having a few drinks together, the couple started to get intimate in the wee hours of Tuesday morning, the Expressen newspaper reports.
Not satisfied with traditional approaches to disrobing, the couple decided that it might be more fun to remove one another’s underwear using a knife.
After the 47-year-old man successfully sliced the stockings off his girlfriend, she gingerly gripped the handle of the knife and took a shot at cutting her boyfriend’s boxers right off his body.
Unfortunately for the man, the 36-year-old woman apparently lacked the same level of skill as her boyfriend when it came to handling sharp objects.
Rather than slashing through his underwear, the woman instead stabbed her boyfriend in the thigh.
“From what we understand, it was a sex act that went a bit wrong,” Maud Johansson of the Västerås police told the newspaper.
On Tuesday morning, the man’s girlfriend was arrested on suspicion of aggravated assault while he recovered in hospital.
Johansson said the woman is “really sad and regretful” about the incident, but that her boyfriend hasn’t filed formal charges for the sex-play cock-up.