I like an average of 7
You can do regular exercise like JELQING, but some good product also available in market for male enhancement like Shaktivardhan Vacuum therapy .. This is good product with any harmful for body.. Visit - http://www.shaktivardhan.com/vacuum_therapy.php
None of the claims they make actually come true, so technically there are no benefits, just a burden where it hurts most... on your wallet