How can someone dislike something as much as the seafarer dislikes life at sea and yet be drawn to it?

It is like he is addicted to it, and he tries to get away from it, but he can't and he knows that even though it is hard, he will grow and learn something from it.
If we see this in biological view, something that attract our curiousity tend to release chemical in our brain that make us drawn to it even though we may be aware about the danger or negative effects of that thing