A Texas man was arrested for sexual assault after a woman came across a Facebook video of her underage daughter passed out naked, KXAN reported.

The unidentified mother from Round Rock came across the disturbing video, reportedly taken last month, while checking her Facebook feed. Her 16-year-old daughter appeared to be unconscious because she did not respond when the man in the video touched her, according to police records obtained KXAN.

The mother called police, who then arrested Francisco Mar-Grafias and charged him last week with aggravated sexual assault of a child.

On Nov. 21, the girl went to the 22-year-old's Round Rock home where he gave her cocaine and alcohol, police said. The victim told police she felt tired and went to take a nap. She woke up naked in Mar-Grafias' bed, she told police. He allegedly told her he used a condom, KXAN reported. 

Mar-Grafias is being held on $40,000 bond at the Williamson County Jail. 

Police speculate the suspect posted the video online because he thought he was showing off.

"There may be a pride factor involved; you can never tell," Rock Round Police Department Sergeant Darin Bayles told the station. "Perhaps they want to draw attention to themselves about what they are doing and may, in some sense, believe in their own mind that it's not illegal or wrong."