"One guy rang me and said, 'One of my girls is coming to see you. Now doctor, you know what I like. Don't take any notice of what she says - that's what I'm paying you for,'" Martinez says.
"So a woman might say, 'OK, my body's yours for six months if you pay for the operation,'" Pedro says.
"It's very normal for a man to have three or four women as well as other girlfriends. It's part of the culture," says Gabriela, philosophically.
Narco culture has fostered the idea that women are property "owned" by men, says Maria Teresa Guerra, a lawyer who has spent decades advocating for women in Sinaloa.
"What we find in Culiacan is a high incidence of violence and cruelty against women - their bodies are found tortured and burned," says Guerra
"I remember the case of a young woman - her boyfriend was a narco. He paid for her cosmetic surgery. When she was killed, the assassins aimed their bullets at her breasts and her hips - the parts of her body the narco had invested in."