Is it not a mistake of Creator not placing devotional interest in the minds of creations like sexual interest?

This question has been put forward by a Saint to make us think on the subject and so please answer it seriously.
All people are attracted towards the opposite sex without any compulsion from parents or priests, without going to any coaching classes, without a pray in Churches/ Mosques/ Temples, that we know. If all were blessed with such a strong interest in devotion also, what were wrong?

Creation starts when necessity arises. But God is Almighty, religion says. He has no necessity for anything. Then why did he create the Universe? Is he Mad? Or is he a fool?