In the 80s, I think, a researcher at Arizona U, in Tucson, noticed that there was nothing in the medical literature about the progression of symptoms following Recluse bites. So, being a researcher, he proceeded to try to make a Brown Recluse bite him, so he could record the changes, etc.
He wrote that it took forever to get the spider to bite him, and he had to antagonize the little beastie a lot, poking it and threatening it, before it finally clamped down. (They earned the name, Recluse, apparently,)
Researchers.