Even if they offer to do Bare Back please don't do it! You really don't know your own or their status. If you have got something and you pass it on to them; think of what you have done!
Many of these boys can only see whats in front of them for the week ahead. The money is all they see and if they get HIV the only Sympathy and Support Thailand offers is in a dictionary between shit and shyphillis. They really have nothing whereas most Farangs have their respective countries health care systems to fall back on.