هُنَّ لِباسٌ لَكُمْ وَ أَنْتُمْ لِباسٌ لَهُنَّ
your wives are a garment for you, and you are a garment for them. (Quran 2:187)
As your know, Quran has a lot of metaphor. one of the aspect of this metaphor is:
garment saves human from dangers, and couple can save each other from spiritual dangers by satisfying their lust. A man\woman never ogle or disloyal when he\she satisfy by his wife.