An Arizona man faces criminal charges for allegedly posing as a fertility doctor so he could sexually molest men while pretending to give them physical examinations, MyFOXLa.com has reported.

Jeffrey Graybill, 40, advertised online, offering people up to $4,000 monthly for sperm donations to support stem cell research, police said.

He was arrested in Arizona on Wednesday and brought to Los Angeles, according to the Los Angeles Police Department.

Graybill is accused of stealing the identity of a San Francisco doctor and posing as a "Dr. Richardson" at a Los Angeles clinic.

Officer Ian Carbonell says he had no medical certification, except some experience as a paramedic.

"The victims didn't know any better. They thought he's a doctor, he knows what he's doing," Carbonell said.

The initial complaint about him, from a victim who provided a sperm sample but didn't get paid in June, sounded like a consumer fraud case, Carbonell said.

After an investigation, Graybill was charged with sexual battery by fraud, identity theft, practicing medicine without certification and other sex charges.

Carbonell said there are two victims in Los Angeles, but investigators reviewed his emails and identified 24 potential victims in California and Arizona.

He allegedly did the same thing in Arizona, according to Jane Robison, a Los Angeles County district attorney's spokeswoman.

"He was allegedly pretending to be a doctor, operating a sperm clinic. He would pay for sperm donors and two males showed up to donate and he allegedly conducted exams and sexually fondled them," Robison said.

Graybill is charged with multiple counts of practicing medicine without a certificate, identity theft and sexual battery by fraud, Robison said. He is being held in lieu of $590,000 bail and is due back in court on Oct. 16, she said.

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The Associated Press contributed to this article.