Laughing Hyena points to this page on collecting bull sperm as an example of an awful job. But I love the last exchange in the interview:
I bet some bulls are turned on by their collectors.
I had a colleague who was collecting dairy bulls and didn't even have to have the artificial vagina. They would recognize his car. He'd drive up, and the bulls would be standing at the breeding stations, getting erections just from the sight of his Volvo.