Sat Nam,
My understaning of Venus Lock is that it balances the right and left brain hemispheres, male/female, sun/moon enery by connecting energy circuits in our body through the pressure points in our hands. This balances our sexual enery, glands, and helps us concentrate. Remember the mudra is different for men and women.
Sex energy from the second chakra includes the sex organs and hips. I thought the legs were part of the first chakra; however, the nerve on the inner thigh is referred to as the sex nerve, so perhaps that is what you mean. Stretches such as butterfly stretch or other hip-openers help stretch and relax that nerve which is often tight on most people. We store fears and traumas in our 2nd chakra, so working this nerve will help release that tention.
Kirti Kaur