Douglas Maher - All Headline News Staff ReporterDuring the October launch of the Shenzhou VI spacecraft, an estimated 40 grams of pig sperm will be taken on board; some kept outside of the spacecraft's biological capsule and some inside, according to Chinese state media.

Research suggests many animals copulate from time to time, without the delivery of semen, which has baffled scientists, as animal sex is thought to be solely driven by the need to reproduce. New studies, however, suggest males may be engaging in "casual" sex to encourage fidelity. Tommaso Pizzari at the University of Oxford and his team studied feral chickens, known for their promiscuity.