Snake Venom
During intercourse, at moment of male climax, you do not "pull out" in time thus causing ejaculation inside the female. Your only option is to quickly suck the ejaculant out like you would the venom from a snake bite. If not done in quick enough time your ejaculant may as well be venom because at that moment your life is over.
"Last night I didn't pull out in time. I had to act fast and suck out the snake venom. "