A US father is furious about a bizarre sex question in his daughter's science homework that was issued at a Florida high school.
The question, part of an assignment for an anatomy class, posed a 'revenge sex' scenario to the students at Westside High School.
Omar Austin spotted it while looking over his daughter's homework, and he shared it online and demanded that whoever wrote and authorised the question should resign.
"Ursula was devastated when her boyfriend broke up with her after having sex," the multiple choice question began.
"To get revenge, she had sex with his best friend the next day. Ursula had a beautiful baby girl nine months later. Ursula has type O blood, her ex-boyfriend has AB blood and his best friend has type A blood. If her baby daddy is her ex-boyfriend, what could the possible blood type(s) of her baby NOT be?" the question asked.
Mr Austin said the question should not be acceptable at any educational level.
"What truly upset me is the fact that they're talking about revenge sex," he told Newsweek.
"Talking about a teenager, or [any] person for that matter, having revenge sex to get back at someone is not something I think is appropriate at any level."
Mr Austin reported the question to the school's principal.
The Duval County Public Schools board has released a statement which said it was "highly inappropriate" and "appropriate and corrective action will be taken".