I want to take some preventing medicines for std. I sometimes have proyected intercourse with female escorts?

Bad choice. If I am understanding your question your life choice can be devastating. Use barrier protection if you are not willing to be more selective. There are no preventive medicines for most problems that could be coming.
Which ones. There are at least 12 diseases that can pass sexually. A few might be prevented by pre-treatment but most will not. The worst, HIV & the forms of HPV associated with cancer won't. If you play the game you need to accept the consequences. Condoms slow some germs but are not 100% effective in any. .