I thought this was funny/gross. It also explains the history of a commonly used English word:
Quote:
Captain Sir Mansfield George Smith-Cumming, KCMG, CB (1 April 1859 – 14 June 1923) was the first director of what would become the Secret Intelligence Service (SIS), also known as MI6. In this role he was particularly successful in building an imperial intelligence service.
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Quote:
When SSB discovered that semen made a good invisible ink, his agents adopted the motto "Every man his own stylo". However, the use of semen as invisible ink was ceased because of the smell it produced for the eventual receiver. It also raised questions over the masturbatory habits of the agents.[4][8]
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https://en.wikipedia.org/wiki/Mansfield_Smith-Cumming