Ryan and Hannah are in a sexual relationship and live together. They share the expenses, but don't intend to get married to one another in the future. This living situation would likely be classified as .

One in which Ryan is getting free sex, while Hannah is simply getting screwed.

Explanation:

Although this is the likely feminist summary description of their situation, it does contain a bit of truth. Men aren't on as narrow a time-table with their ability to be fathers as are women with their ability to be mothers. Women are under more time pressure, since, if they haven't any children by their mid-30s, the chances are pretty good that they never will.

yes, since there is a positive and a negetive if the positive and negitive wasn't there wouldn't a flow electricity in it.

b) to encourage free trade