Female inmates sterilized in California prisons without approval

"Doctors under contract with the California Department of Corrections and Rehabilitation sterilized nearly 150 female inmates from 2006 to 2010 without required state approvals, The Center for Investigative Reporting has found.

At least 148 women received tubal ligations in violation of prison rules during those five years – and there are perhaps 100 more dating back to the late 1990s, according to state documents and interviews."

ARE THE PRISONS CO-ED THESE DAYS? 
HOW ELSE WOULD THESE WOMEN GET PREGNANT IN JAIL?