A Fitbit, for those of you who don't know, is a heart-monitoring exercise device you wear around your wrist, so you can know exactly how much weight you aren't losing.
But apparently, it can be used for another purpose: mapping an eight-minute sexual odyssey with a partner.
What surprises me is this person's heart is at basically the same rate when orgasming as when her or she is just on top.
So either his or her orgasms aren't very intense, or this person's breathing REAL hard while on top and needs to work on cardio.
This, ladies and gentlemen, is what a person's heart is doing during sex.
Oh and, as you can see, after sex is over, you die.