What an interesting concept!
OK, I have few question/comments about the implementation of such concept:
- Do the two parties agree on the length of the relationship before committing to it?
- If yes, that would make the concept feasible, however, I didn't know a person who's ready to put a 'deadline' on a romantic or a happy feeling (i.e. I think there's a tendency to 'hope' that such feelings will last forever.)
- If no, then the two parties will go into the romantic relationship knowing that either of them can terminate it at any time. For me, this is like knowing I'm going to die, so I go on enjoying my life, but definitely it won't make me 'happily' accept the idea of death when it comes. I highly doubt that one party of that relationship will happily accept the breakup when it happens (but again, who said that they should happily accept the breakup! :) Some agony might help bringing us back to earth.)
- What if the relationship resulted in children? does this break the agreement or forces it to go into non-serial-for-ever relationship?
again, that is such an interesting proposition :) But I still doubt its applicability (at least I can't see myself doing it.)