Marsh's wife, Gwendolyn "Wendy" Marsh, is also named two lawsuits, the Houston Chronicle reported. Anthony Buzbee, a Houston lawyer, is representing both plaintiffs, identified only as John Doe 1 and John Doe 2.
Marsh is an artist who created the "Cadillac Ranch" -- a field with 10 Cadillacs, all in bright colors, with their rear ends in the ground and their front bumpers pointed to the sky. He has placed fake traffic signs around Amarillo with messages like "Road does not end" and "Lubbock is a grease spot."
One of the plaintiffs says Marsh molested him when he was 15 and 16, forcing him to take Viagra and paying him based on his sexual performance. He said the sex took place on one occasion at Toad Hall, the Marshes' home, with Wendy Marsh escorting him to her husband.
Randall Sims, the district attorney in the Amarillo area, said Stanley Marsh faces no criminal charges.
He would not say whether there was an ongoing investigation.