Scientists at the Institute for Sex Research were puzzled at some data regarding a peculiar change in rate of orgasms for South Dakota. During Spring and Summer, South Dakota ranked 17th of the 50 states in frequency of orgasms (just ahead of Arkansas); but the Coyote State's rate dropped to 47th (just ahead of Massachuetts). Some researchers hypothesized that this was due to Seasonal Affective Disorder.
However, a simpler explanation was found to be the real reason. South Dakotans wear mittens in the winter.