Have you ever wondered what goes on in your neighbors' bedrooms? Well, we're here to tell you.

No, we didn't go all Patriot Act on strangers. We just read the results of Trojan's recent sex survey.

Turns out, if your neighbors are like 75 percent of Americans 18 or older, they have had sex within the past year. Which means, if Trojan's random sample of 1,000 people is indicative, a quarter of adult Americans have not had sex within the last 12 months. Of course, unsurprisingly, both the frequency of sex and reported satisfaction with it goes down with age. Sigh. Top Myths Men (And Women!) Have About Sex

Ah, cheer up. Here are some other fun sex facts to know and tell:

1. Americans have sex seven times per month. Or, on average, 1.5 times a week (you know those .5 romps—they produce those .86 kids for the national 1.86 average).

2. Of the top 10 biggest cities, Houstonians reported having sex most often—and San Franciscans the least. Here's where the rest fall:

Houston
Atlanta
Washington D.C.
Los Angeles
New York
Boston
Chicago
Dallas-Fort Worth
Philadelphia
San Francisco

3. As ever, quality still beats quantity. Just because the Space City residents do it most often, Atlanta's peaches (73 percent) and New York's apples (71 percent) rank above the Houstonians on the satisfaction scale. Bostonians were the least satisfied, with 60 percent average satisfaction. While unmarrieds tend to have more sex during the week than marrieds, 95 percent of those who are hitched rated their sex lives an average 7.4 on a scale from one to 10. Unmarrieds, on average, rated their sex lives a 5.8. 10 Oral Sex Tips From A Man

Now, we can't tell you for sure what happens horizontally between all American sheets (and, frankly, we don't want to), but at least now we can make a better guess.