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.}}