It's a royal prerogative in Islam. The Saudi princes regularly take 'wives' for a brief stint and then divorce them so that they don't exceed the limit of 4. It's all quite in keeping with Sharia Law.
So Abu's martyr's reward in the afterlife is quite safe. Castrated and roasting on a spit stoked by 72 demons virgins. (Allah left some of that out in the fine print).