Mar 4, 2015 · 2 minutes

Pornhub is many things... okay, it's really only two things -- a massive repository of adult videos, yes, but also a conduit for unearthing fascinating data sets about human sexuality. What makes this data so unique is that, unlike other sexual research studies, the results are not based around subjective surveys. No, they are based on the real viewing habits of Internet users. So while a bible-thumping Arkansan man may not fess up to feeling aroused by other men, his Pornhub browsing history cannot lie. And indeed, Pornhub data had earlier shown that in the US, religious cities watched just as much porn as non-religious cities.

Now, the porn giant has a new data set to share -- one that addresses a question we've all been curious about, even if we don't want to know the answer: How do our grandparents watch porn?

Although the average age of a Pornhub visitor is 35.3, 7 percent of its user base is between the ages of 55 and 64, and another 5 percent are 65 and older. That's not all altogether surprising. But as usual with these porn studies, the most interesting findings were related to search terms and subject matter. For whatever reason, the older the Pornhub users, the more likely they are to search for "massage" porn, which dominates the 55-64 and 65+ age ranges. Meanwhile, younger groups are strangely fixated on "step mom" porn, which tops the most popular searches for 25-34 year olds, 35-44 year olds, and 45-54 year olds. (It came in second for the 18-24 demographic, losing only to "lesbian.")

Pornhub also looked at age demographics across different countries, finding that the United States was a bellwether for the rest of the world -- its average porn-watching age was 35.5, compared to the worldwide age of 35.3. The oldest average age was in Japan, clocking in at 41.1, while the youngest was in India, at 30.3.

The percentage of Americans over the age of 65 who go online -- which at last count was 59 percent -- is slowly but surely catching up to the average number of American adults overall -- which sits at 86 percent. The fact that younger porn-watchers outnumber porn watchers over 65 to a far greater degree, suggests that a digital divide is not the only thing to blame for this discrepancy, and that there may be cultural or societal pressures keeping senior citizens away from Pornhub. Either that, or they're just nostalgic and prefer the paper magazines they tucked away under their beds as youths.

Read the full results of the study here.