They wanted bondage, and they wound up in handcuffs.

A Portland, Ore., couple was arrested on Valentine's Day after cops mistook a bound and naked woman in the back of a car for a crime in progress, The Los Angeles Times reported.

Nikolas Harbar, 31, was only "role-playing" when he allegedly tied up his naked girlfriend, 26-year-old Stephanie Pelzner and threw her in the back of his Subaru in the early afternoon, according to a police report. But the ball-and-chain action went awry when cops got a call from a concerned witness.

"Officers continued to check the area, concerned for the welfare of the bound and naked female," the report reads. "The vehicle was spotted ... an officer made contact with a male walking away from the car and noticed a bound and naked female in the back of the car."

Harbar told cops that the two "were just having some fun," and Pelzner confirmed that "she was voluntarily bound a nude." But officers weren't so quick to laugh it off -- After all, they had already sent at least nine patrol cars to look for the sex fiends, Fox News reported.

"The concern is their actions created a pretty substantial public alarm, to the point where you have a 911 caller saying she's concerned about this person tied up naked in the back of a car," Lt. Robert King, bureau spokesman, told the Los Angeles Times. "Why would the officers think it was a Valentine's Day thing ... it creates a lot of concern from the public."

Harbar and Pelzner were arrested and charged with disorderly conduct, but released later that day.