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Sex where someone or both people have a gun to their head because the other person is a total lunatic.
My cousin had a nailgun with my aunt. She had a gun to her head and screamed, 'I will not marry you!'
My uncle said, 'If you don't marry me, I'll shoot you!' and he pointed a gun at my cousin's head.
My friend's ex had a nailgun with him, and he shot her in the head during their wedding.