BAKERSFIELD, Calif. -- A 140-pound rapist met his match in an angry, 275-pound prostitute, police said.

Adrian Castillo Ramirez allegedly tried to sexually assault a 24-year-old Bakersfield prostitute who was nearly twice his weight.

But she took his knife, stripped him naked and paraded him in front of other prostitutes, after asking how many of them had ever been forced into sex at knifepoint. Then she tried to take him -- still naked -- to the police station, reports said.

Castillo was charged with failing to register as a sex offender, and with committing forcible sex acts on the 24-year-old and on a 37-year-old woman in a previous incident. He was convicted of four counts of rape in 1988.

Castillo pleaded innocent Wednesday, and is being held on $250,000 bail, police said.