I was wondering how they got to be so stupid as not to know how to get a girl pregnant. Seems they are mostly homosexual....having started having sex as a boy with men.....they intermarry continuously...say two brothers marry two sisters....guess what....their children are only cousins and they can marry and reproduce. The gene pool is in a downhill spiral. No wonder these guys are so intent on killing themselves in jihad. No brains, no future...might as well kill myself and get 57 virgins...hmmph....they really don’t mention the sex of those virgins. Ever think of that?
Polygamous societies also limit the number of wives available for common men. Add in religious restrictions on the sexes mixing and it is no wonder you have ignorance and the willingness to sacrifice for Allah.