As OC said, providing you don't go wandering off looking for trouble, you should be fine. Do your research and stick to either La Zona or one of the established escort agencies. Maybe try a massage parlor but they are normally not the best that TJ has to offer.
The most common causes of death with regard to TJ mongering are heart attack and stroke. The number of overweight, hard-smoking, hard-drinking, beet-red nosed, middle-aged U.S. mongers in La Zona is akin to the number of grains of sand on the beaches of Southern California. Add in a dose or two of an ED pharmaceutical and you have the most dangerous situation in TJ for mongers.
Relax and enjoy yourself. Be sure to tell us how it all turned out. Happy Hunting!