Who would understand what you are talking about, and why you chose this topic for your thesis. I don't get it.
Sankies that work in resorts get tested for HIV when they first get hired to work in resorts. I don't know if there are follow up tests required and if so how often. I'll see if I can find out.
Sankies perform sex on the fly and if you (the tourist) doesn't have a condom, they won't.
If you go to a cabana, they provide them for you.
Trust and condom use go hand in hand. As mentioned, having unprotected sex in this day in age is stupid, especially with a one timer on a vacation.