An 18-year-old Texas woman has been accused of forcing a child she was babysitting to perform sex acts on her.

Police in San Antonio arrested Esmeralda Marie Medellin Thursday night on sexual assault charges, the San Antonio Express-News reports.

The child reportedly told his mother that Medellin ordered him to perform a sexual act on her while she was babysitting the boy on March 28, an arrest affidavit states.

Upon hearing the news, the mother called police when the woman was still at the home.

Both the child and Medellin were brought to a hospital to undergo a sexual assault examination.

Investigators then took Medellin to the police department, where she provided a voluntary statement denying all of the allegations and was later released from police custody, court records show.

Earlier this month, the results of the sexual assault examination came back. They show that the boy’s DNA was found on Medellin’s breasts. Male DNA was also discovered on the woman’s genitals, but the genital DNA sample was not adequate to make a positive match, the newspaper reports.

Police subsequently arrested Medellin on suspicion of aggravated sexual assault of a child. She was still in Bexar County Jail on Friday pending a $75,000 bond, according to the newspaper.

About one in six boys and one in four girls are sexually assaulted before they reach the age of 18, the U.S. Centers for Disease Control and Prevention reports.

Approximately 90 percent of victims know their abuser, and 60 percent are assaulted by someone the child’s family said they trusted, according to the child sexual abuse prevention group, Darkness to Light.

[Feature Photo:  Bexar County Sheriff’s Office]