Ball sack... Or?

Today, while sitting in my room studying in peace and quiet, I suddenly started to think about balls and if there´s a word in the english language for balls and sack in one. Do you really have to say ball sack? Or do you just say balls? This started to piss me off, because I couldn´t concentrate on my studies, so I googled it but what did I find? Ball sack! After a while I found it though. Scrotum. I have never in my life heard the word scrotum. Is it anybody out there who uses this word to describe ball sack? Please let me know.

And here´s a little picture so it´s clear what I´m talking about.

PS. I´m not gay. Sometimes you just think about scrotums.