Horrific beetle sex described at Not Exactly Rocket Science.

The duo studied beetles taken from 13 countries across the tropics, from Brazil to the USA, and from Nigeria to Oman. The genitals of these different populations are very varied and to study them under a microscope, Hotzy and Arnqvist first had to fluff their subjects. They anaesthetised the males with carbon dioxide, and erected their penises with an “artificial inflater” – a microscopic plastic tip connected to a pump. Under a microscope, they measured the length of the longest spines and the size of the entire spine-bearing area.

Probably NSFW if you happen to be employed by Coleopt-R-Us