You know, the מעשה helps as well

Today in shul, a young fellow inquired about my family status. After finding out that I've been married for over two years, and don't have kids yet, the guy stated:

"You know, the most important thing [in the business of having kids] is the tefilla (prayer)"

to which I answered

"Yes, but the מעשה (the deed) helps as well"

Reminds me of the Russian joke about the tomato juice that I heard from a rabbi. Here's how it goes:

A professor was asked: what is the best contraceptive? He answered: Tomato Juice. The audience was puzzled. Finally, a student asks: "Before or After (До или После)?". The professor answers: "Instead (Вместо)."