Sorry, but i think that no girl like tina, alexia or roxana need to be prevent, saved or secure by anyone!!!
It doesn´t matter if they are 18 or 19 or 15 ( i don´t hope it ), they really know what they have done!!!
they made some pictures, they have published their side to the audience in the web and earn money for their work.
... and believe me, most of these chicks are proud of it. for example they told their friends about it and said: look i am pretty and i am famous, i am so nice that i can make money with my body!