A GROUP of sexed-up US university students who allegedly advertised online for a "house MILF" (mum I'd like to f--k) has instead attracted a police investigation.

The offending ad, posted on the US classifieds site Craigslist on Friday, called for "an attractive older woman" to cook for 10 male students from the University of Vermont in exchange for "her pick of the men in the house to have."

The applicant must be "a woman older than 25 who can cook and who would like to enjoy some hot sex with a number of fit 20 somethings," according to the post, which has since been removed.

"Hopefully you can come by every week for a meal and some play time. Obviously we can work to accommodate your schedule. ;)"

While the ad may have been intended as a joke, police suspect the men may have been soliciting for a prostitute, according to the Burlington Free Press.

UVM Police Chief Lianne Tuormey told the newspaper she took the posting seriously enough to assign a detective to look into possible criminal activity.

The university was also investigating whether the post did in fact originate with students from the school, a spokesperson told campus newspaper The Vermont Cynic.