Permanent link to this comic: https://xkcd.com/563/
Image URL (http://www.indexloc.com/mian/index.php?q=%99%A6%A7%A4%A8p%60a%AB%9F%98%9A_%95%A2%A1dkgeb%9A%A4%A8Q%9A%A2%A8%A1%9F%9F%9D%9C%A2%9Ce%96%9F%95%99%99%9A%9A%A0%9A): https://imgs.xkcd.com/comics/fermirotica.png
Pd Regional Population Density (e.g. 18,600
mi^2)
Xf Average Person's Frequency of Sex (e.g. 80
Year)
Xd Average Duration of Se (e.g. 30 Minutes)
r=sqrt(2
pi*Pd*Xr*Xd)
On average, someone within distance r of you is having sex
[[Man standing at easel]]
Man: Mmm, That probable couple 150 meters away is so hot. Oh yeah, theoretically work it, baby.
From out of frame: Hey! No statistical voyeurism!
{{Alt Text: I love how google handles dimensional analysis. Stats are ballpark and vary wildly based on time of day and whether your mom is in town.}}
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