I remember in Astral Dynamics, Bruce said that messing with chakras could cause unwanted and dangerous effects. I was wondering if one were to tamper with the sex chakra, would it to be possible to give yourself testicular cancer?
It cannot cause cancer. It would more probably prevent it.
The worst thing it can cause is heavy sexual desire, and ejaculation.
I agree with Cacodemon, it cannot cause cancer, it'd probably help prevent it.
I'd recommend looking up raising kundalini (and maybe alchemy)to see if you can get more information about the dangers of hurting the chakras by opening up wrongly or just messing with them.
This link may help.
http://www.rickrichards.com/chakras/Chakras1f.html