Police say 37-year-old Robert Chuksorji faces two felony rape charges and a kidnapping to commit another crime charge.
Police say he would meet women on both social media and dating apps. He would get their phone number and start a texting relationship.
Investigators say he may not have used his real name in some of the cases that date back 10 years.
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Authorities say Chuksorji would plan a meetup, and that would later turn into a sexual assault.
Antioch police say if you have any information or were victimized by Chuksorji, feel free to reach out to them.
In a statement to ABC7 News' J.R. Stone, his lawyer said:
"Robert Chuksorji is an innocent man who has been falsely accused by his accusers. HE has never raped or sexually assaulted ayone and we look forward to our day in court where these allegations can be tested an shown to be false. Like anyone arrested and falsely accused, Robert is innocent in the eyes of the law unless and until proven guilty in court. Robert Chuksorji is a good man who was raised by strong women who taught him to respect women. He would never sexually assault or rape anyone.
Robert Chuksorji is represented by Seth Morris of Morris Law, PC."
The Contra Costa District Attorney's office says that Chuksorji is due back in court on Nov. 22.
Bail was previously set at $2 million, but the defense introduced a bail motion to reduce that amount.
The judge will hear their arguments at that time.