As others have said, pregnancy is a big no-no. Also, I would be very wary of power imbalances unless both people were already living on their own.

I don't think the no-children issue is as much of a showstopper as some of the other replies, though--some people simply don't want children, anyway. If both people are such a big roadblock is gone.


As for personally: Moot--I have no sisters.