"Well, um, that’s supposed to be spontaneous… Let’s just sit back and wait for science to work.
-5 min later-
Well then, it seems that chemistry has magically stopped working. Moving on!"
My chemistry professor when his demonstration failed (was contaminated)
Scientists have identified a new way to keep sperm in storage during sex, so when ejaculation occurs there’s no sperm. The researchers produced genetically modified mice that couldn’t ejaculate sperm and then showed how the process could be reversible, keeping the sperm unaffected and producing almost no side-effects. The scientists believe the same result could be achieved in humans using two drugs—one of them has already been developed.