Walk down calle Coahuila, and in the distance, you can see the landmark avenida Revolucion clock under a monumental arch. But really, perhaps Tijuana is even more famous for hedonism signaled by the posters and signs lining Coahuila. It seems every other door leads to a "hotel" with a smattering of bars and gentleman's clubs, and even, for the romantic at heart, a flower shop. Inside, many of the women, teens and girls who work in the sex trade are slaves to international criminal organizations.