Note: Objections to this proof on the grounds of the inclusion of Johnny Depp should be addressed to [http://elsa.berkeley.edu/~rabin/ Matthew Rabin].
==The Age Rule==
The defacto standard age rule is as follows:
Denote two people <math>i\;</math> and <math>j\;</math> such that <math>Age_i \le Age_j</math>, then it is acceptable for them to date if and only if
:<math>Age_i \ge \max \left\{\left(\frac{Age_j}{2}\right)+7\;,\;\underline{Age}\right\}</math>
where <math>\underline{Age} = 18 \;\mbox{if}\; Age_j \ge 18</math>, except in Utah.
I finally found a source to attribute this to: XKCD predates my posting significantly with its [http://xkcd.com/314/ 'Standard Creepiness Rule'].
==Random Love==
An amusing exploration of Random Love was recently posted as [http://what-if.xkcd.com/9/ XKCD Blog article No. 9].