Law used when trying to estimate how many "dicks" the average girl (not a cum dumpster) has been with. To properly use the law, start with age 17 and add 1.5 dicks for every 3 years until you reach girls current age. When rounding is needed, always round up.
(Age - 17) / 3 * 1.5 = # of Dicks (always round up)
Matt: I just started dating this new girl
Joe: How old is she - how is the law of dicks looking?
Matt: She is 28 so I bet she is at 6 dicks
Joe: Not too bad, hope she knows what she is doing.