When my 11 year old daughter asked me this very question, I was confused and didn't know what the heck she was talking about. So she said, "You know, general heartbeats, like in the commercial with the guy and the girl." Still, I was like, huh??? I finally figured it out...seems she had watched one too many Valtrex commercials!!! LOLOL I was laughing so hard. Of course, now everytime we see those commercials, we have to tease her a little, although I have to say, I love that kind of innocence! =) (I still haven't explained what genitial herpes are yet...just that you can't die from them, which was her second question...lol!!!)