أَوْ يُزَوِّجُهُمْ ذُكْرَانًا وَإِنَاثًا وَيَجْعَلُ مَن يَشَاءُ عَقِيمًا إِنَّهُ عَلِيمٌ قَدِيرٌ

or He combines them males and females, and makes sterile whomever He wishes. Indeed, He is all-knowing, all-powerful.