A 33-year-old Grafton woman was fighting for her life Thursday night after she drank concentrated drain cleaner given to her by a man who then videotaped her violent vomiting for his sexual gratification, Milwaukee police said.

With just two gulps, the caustic solution seared a path from the woman's lips down to her stomach, burning holes along the way and then likely scorched her again as she vomited the poison.

The woman, who was not identified, was at St. Michael Hospital, according to one of the victim's co-workers. Police said she might die.

Detectives are studying a videotape that shows the woman drinking the solution and then throwing up. Police said the tape shows at least three other women drinking solutions and becoming ill.

On Tuesday, police arrested Sean A. Kobin, 20, of Mequon, near the former Northridge Mall on suspicion of first-degree recklessly endangering safety, according to arrest records.

A registered sex offender in Wisconsin, Kobin was convicted last year of exposing a 13-year-old girl to harmful materials by urging her, in a series of phone calls and computer messages, to drink bleach, lighter fluid and urine to arose him sexually, according to a Waukesha County criminal complaint.