What country can you advise? I have traveled all over Europe and America, I think to go to Asia. But I don`t want to catch some kind of disease
You just need to get certain vaccinations. Go to the local doctor and he will tell you everything. I advise you to go either to Phuket or Vietnam. They have cheap prices and great views.
You do not joke with this. My friend was in Africa and slept with a girl. After that, he was treated for 2 years