Is there a chakra involved with sperm production and sex ?
If I am not wrong, it is the muladhara or the most basal chakra in our spine.
What is with you and sperm!? O_o LoL
It's a combination of the Root Chakra (the one at the bottom) and the Sacral Chakra (the second chakra up).
The Root deals with primal sexuality, sexual urges. The Sacral is what I would consider to be more involved in sperm production and sexuality in human terms (it also deals with the sub/unconscious and childhood issues that haven't been dealt with).