Selling or exchanging female bees without a permit was also illegal. (slaw.ca)
Many orchids also look and smell like females bees, and induce males in similarly fruitless dry humping (or «pseudocopulation,» if you want to be scientific about it). (discovermagazine.com)
They found that in pollinated flowers, there's a two-fold increase in a substance called farnesyl hexanoate, an insect pheromone normally released by female bees to signal that they have already been inseminated. (sciencemag.org)