Kevin H. Pressley, 24, was charged with indecent assault, indecent assault with an unconscious person, indecent assault without consent of other, invasion of privacy, harassment and disorderly conduct.
Jacqueline Heidt, 37, was removed from her position as a unit supervisor at at the Racine Correctional Institute and arrested after the inappropriate relationship came to light.
Theresa Ramirez, 41, was facing charges including unlawful sex with a minor, one felony count of oral copulation, and one misdemeanor count of contributing to the delinquency of a minor.
Esmerelda Upton was later charged with single charges of Assault Bodily Injury and Terroristic Threats after the four women reported her to the police.
The officer, identified as 33-year-old Eddie Taylor, provided food items to female inmates and in exchange, asked them to perform lewd sexual acts for him.
The inmate alleges Simmons called him her "personal sex slave" and sexually abused her while she was working as a mental health counsellor at the jail.