Caution: Sexual innuendo ahead.
The withdrawal method is a notoriously unreliable form of birth control. It seems that what happens between the sheets applies to paper as well as cotton.
Here’s a retraction notice from BMC Research Notes that speaks — and nudges and winks — for itself. The 2011 article, “Effect of controlled and uncontrolled cooling rate on motility parameters of cryopreserved ram spermatozoa,” by a team of Irani veterinary scientists: Continue reading Wham, bam, no thank you, ram: Publisher error leads to retraction of already-withdrawn sheep sperm paper