Friendship charity curiosity. Its entirely possible that the only desire here is the desire to travel. But then theres always that small chance its not.
Never underestimate the power of a raging libido. Humans like to think up all sorts of higher reasons for why we do the things we do, but at the ba<x>se of it all is always finding a mate. Observe the endless and exhaustive courtship behaviours exhibited in the animal kingdom, and you realise Freud was onto something.