CASSVILLE, Wis. -- The three men arrested for allegedly digging up the grave of a woman who died last week in Grant County are also charged with attempted sexual assault.

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The three men appeared in Grant County Circuit Court on Tuesday. According to a criminal complaint, the three men were charged with digging up the grave at the St. Charles Catholic Cemetery in Cassville with the intent to have sex with the victim's body, WISC-TV reported.

Alexander Grunke, his twin brother Nicholas Grunke and their friend Dustin Radke -- all 20 years old -- have been in a Grant County jail since Saturday.

The grave that the men are accused of trying to dig up belonged to Laura Tennessen, 20, of Cassville, who was buried last week after being killed in a motorcycle crash on Aug. 27.

The men were formally charged with attempted theft and attempted third degree sexual assault.

Radke allegedly confessed and said that the incident was an elaborate plan to have sex with the corpse. He told authorities that Nicholas Grunke asked him to help dig up Tennessen's grave and take the corpse back to a pre-selected location behind his house with the intent to have sex with her, WISC-TV reported.

Authorities said that Radke said that the three stopped at the Wal-Mart in Dodgeville on their way to the cemetery and bought condoms.

If the three men are convicted, they could face more than five years behind bars for both the misdemeanor theft and the attempted sexual assault, which is a felony, WISC-TV reported.

The bail for Radke was set at $1,500. For both Nicholas and Alexander Grumke, bail was set at $1,000.