These new marriges are also about the joining of families. The propagation of blood lines is what is currently leading humanity as to extinction and dragging the entire bio sphere with it. The obsession with propagation is a prehistoric thought partner and one that propagates sexist oppression and any one who thinks otherwise is a hateful or brain washed human being. I know I'm bringing environmental concerns into this but as the most powerful species on the planet there are too many of us here for the earth to be sustainable. The most power species needs to be the fewest in number in order for an eco system to work. There are many animals immediately in danger an thus have far fewer numbers than our own. The kind of importantance you seem to be espousing "propagation of bloodlines" with is not only sexist and homophobic but a concept which is dangerous to all life on the planet particularly if fossil fuels continue to be used.

@Greyjedi I am not "espousing"; I am explaining a tradition.
I would also argue that the "obsession with propagation" is simply the natural mechanism of the urge to reproduce : common to all Nature. It's not a deliberate thought-plan of action.

You are correct: the Human population is at the tipping point.
My views are analytical not judgmental.

@EugenieLaBorgia very good point.

@Misspotat why would i be talking about a demon here?