A WOMAN accused of slicing a mans genitals with a box cutter, because she believed he molested her 2-year-old son, has been arrested.

Police were called to a mobile home in Johnson County, Indiana, where they spoke with a man, who had blood stains and a cut on his penis, Fox59 reports.

The man claimed his girlfriend’s mother - Bonita Lynn Vela - had held him captive, refusing to release him until he allowed her to cut his penis.

Police said Ms Vela told him "he wanted to scar him so that he would have to look at it every time that he had sex in the future."

In a written statement, he described Ms Vela as "extremely mad" and "out of control" and said she threatened to turn him in for molestation, in spite of the man’s denials.

He told investigators Ms Vela was "going to take him out, shoot him in the head and tie him to a tree so the animals (would) eat him." He said she then told him to drop his pants so she could "cut his (expletive)". If he didn’t comply, "she was going to have people hold him down and she would cut (his penis) all the way off," the report said.

Ms Vela said she had been at a friend’s house where she smoked marijuana, and was unsure "if that was the only drug she ingested".

Around 3am she had a friend fetch her daughter’s boyfriend, so she could demand to know if he had molested her son. Her "anger just grew" throughout the encounter, the report said.

Ms Vela’s initial efforts to draw blood failed, after which she switched to a box cutter. The man said Ms Vela told him to "choose his life or his penis".

Ms Vela claims she had the box cutter in her hand, but the man knocked it away and that that is how the man’s penis was cut. Ms Vela asked police "several times how (the man) was doing and wondered if he was going to ‘make it,’" the report said. She told investigators that she never intended to hurt him and wanted to scare him.

Ms Vela was taken to the Johnson County Jail on charges of criminal confinement with a deadly weapon and battery with a deadly weapon.

Police said the investigation into the molestation claim is ongoing.

