Salt is a Natural Spermicide!

Oldest trick in the book in chemistry. It's called driving the reaction to the right.

You consume more salt than your liver can absorb and filter thereby releasing the residual into your blood stream.

Then when you ejaculate your ejaculatory fluid contains too high of a saline concentration for the sperm to survive.

Don't believe me give it a try!

If it doesn't work increase the salt intake.