• Warning: This article contains explicit sexual content

If you watch any of those iconic 1990s erotic thrillers, like Basic Instinct, Fatal Attraction, or Wild Things, sex would seem to be a hot, sweaty affair. It's like an hour-long calorie-burning extravaganza that the characters do instead of going to aerobics. For the last eight years, we've gone to Game of Thrones for the same experience: virile, athletic, sweaty sex scenes that basically make the camera lens fog up.

It makes us all wonder how good of a workout sex actually is. Does it expend as much energy as a run?