are,
The 'hip', and by extention, the procreative powers.
Also called 'the reins'; "In Scripture, the inward parts; the heart or seat of the affections or passions."
(Noah Webster's 1828)

Stand therefore, having your loins girt about with truth, and having on the breastplate of righteousness; And your feet shod with the preparation of the gospel of peace...
Ephesians 6:14-15