I have done the international trips with a couple of clients.
My conditions:
1. We need to see each other a few times before I even consider traveling with you. This means screening will have already taken place.
2. I've introduced client to reliable friend who will have details of the trip. This means someone else other than client will now my whereabouts.
3. This is not a vacation for me. I make sure that I am paid for my time when I am with a client. If I want a real vacation I can take it on my own. Which I do from time to time.