During World War I, members of Britain’s MI6 discovered that semen could be used as an invisible ink. The bodily fluid didn’t react with the traditional detection method of iodine vapor. They stopped trialing it when it was discovered that stale semen could be detected by its smell. – WTF Fun Facts
Source: https://www.telegraph.co.uk/news/uknews/8015180/MI6-used-bodily-fluids-as-invisible-ink.html
On the Queen of England’s birthday in 2015, she was given a gift of £5,000 worth of stud sperm by horse breeder Christina Patino. – WTF Fun Facts
Source: https://www.huffingtonpost.co.uk/entry/queen-elizabeths-91st-birthday-2017-the-weirdest-gifts-her-majesty-has-ever-received_uk_58f9d670e4b00fa7de131965?guccounter=1&guce_referrer=aHR0cHM6Ly93d3cuZ29vZ2xlLmNvbS8&guce_referrer_sig=AQAAAMsMKqa7WZh2e1b4AvCjvBnlo8F8SXTxHOXbAZUQa-_0614wgdq5kmE5z_C3kI4ABDDRsfduqi_luDaTXslk4-k-I07Z2h1i4lP24Vl0LGNyVkqhMeWJlV7qTNSPvGlp_B1Y8Y3cChiW-j3AiE1nomHeyADhfld92f_pLXtuWqpV
Insulin used to be combined with protamine, obtained from rainbow trout milt/semen, to prolong the effect. – WTF Fun Facts
An endangered parrot in New Zealand was only mating with people’s heads, so they made as ‘ejaculation helmet’ for people to wear which would collect the bird’s rare semen. – WTF Fun Facts
Source: https://www.smithsonianmag.com/science-nature/seduced-rare-parrot-180962855/