There’s a site called the US Inflation Calculator that allows you to enter two dates, and adjust prices for the amount of inflation that occurred between them. Entering the figures, it turns out that an item that cost $8.10 in the United States in 2005 would cost $9.79 today. In other words, porn prices have almost exactly tracked inflation.

Or have they? Twist ahoy!

It turns out that price isn’t the only thing getting bigger in porn… lengths are too, and I’m not talking about the performers (that data wasn’t available, sadly). The average clip has swollen from a respectable eight minutes to an eye-watering nine-and-a-half over the last decade, while the price per minute has risen from $1.15 to $1.25. If we adjust the 2015 figure for inflation, prices have actually dropped in 2005 dollars from $1.15 to $1.03.