I remember once seeing a video on a farming prog how they collected bull semen. It involved men in white coats leading the bull into an arena in which there was a half cow hollow shell inside which crouched two more chaps in white coats, apparently this was enough bovine erotica to get "Bully" in the mood and as he mounted said hollow shell whereupon the two chaps inside the cow shagdoll clamped a rather brutal looking vacuum cleaner type device on Bully's pride and joy and "extracted" the valuable liquid. Apparently the semen of a prize bull is even more expensive than printer ink!
Disappointingly, the current method is more scientific but less amusing, Bully is held in a cattle crush and an electric probe is used to produce the required ejaculate. This is probably the reason why aliens do this to people?
