I am a male, 42 years old. Before 2008 I had several experiences with escorts. All protected except one time unprotected oral sex. I was tested for all the common STD's in September 2008 with negative results. After this, I have had some erotic massage experiences after 2013. No penetration. I was tested again by the end of 2010 for chlamidya, gonorrea and trichomonas. Everything negative. Some weeks ago I have been tested again and again negative results. The trichomonas exams were all direct observation at the microscope. And here comes my question: I have read that this is not very sensitive, should I worry about the results? Is it possible to be infected on trichomoniasis thorugh the erotic massages? Thanks a lot in advance.