A Sioux Falls motorist did a double take on Saturday afternoon and was stunned at what was happening.

"We had somebody driving by in the area of 2nd Street and Spring Avenue. The motorist saw two people, both of them had their pants down. They were actually inside or underneath a pine tree," Police Department Public Information Officer Sam Clemens explained.

They were engaged in a sex act. The eyewitness was alarmed by this and called police. The officers got there and found the two people still engaged in the sex act. Both of them were arrested for indecent exposure."

Clemens says the woman was also charged after spitting at police officers.

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