This is true in most cases, although many Dominican women are quick to dump their barrio love for a better financial prospect, age not important. These are grown women, so whom do you think the younger ones imitate. Mothers even encourage them. Poverty plays a major role, but so does greed.
Monkey see and monkey do.
I've been offered several times a 17 year old daughter by the parent and it was not just in the DR. Poor parents trying a "gringo" to take care of their daughter and at the same time they might get some help.
Off course I have also seen mothers turning tricks, teaching their daughters the trick of the trade and helping them get Johns.
Furthermore sex is a big part of the culture, just listen to the music and watch them dance. How many times have you seen little girls twerking to the music while being encouraged by the adults?
"Esa sangre latina es muy caliente"