It's private and yours !

Yahweh wants your penis to say thanks to him!

If his loins have not blessed me, and if he were not warmed with the fleece of my sheep; (job 31:20)

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Loins have not blessed him? I.e the private parts of a man this is no doubt since we have several other references where loin is the private part of a man for example :

All the souls that came with Jacob into Egypt, which came out of his loins, besides Jacob's sons' wives, all the souls were threescore and six; (Genesis 46:26)

We can read from the above text all those souls who came with Jacob came out of his LOINS!

Commentary  

Barnes' Notes on the Bible

If his loins have not blessed me - This is a personification by which the part of the body that had been clothed by the benevolence of Job, is supposed to speak and render him thanks.

 

Gill's Exposition of the Entire Bible

If his loins have not blessed me,.... Which were girded and covered with garments he gave him; which, as often as he put on and girded his loins with, put him in mind of his generous benefactor, and this put him upon sending up an ejaculatory wish to heaven, that all happiness and blessedness might attend him, who had so comfortably clothed him; 

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Let's get a little deeper with the word loins the Arabic word for loins found in the bible is Sulb صُلْبِهِ which no doubt means the male private... So the question is is Yahweh expecting the Penis Male private part Loins for praise him?

Do you really want a god like Yahweh ask yourself!