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.
My man's cumming in the field, alright.
https://en.m.wikipedia.org/wiki/Mansfield_Smith-Cumming
Wait…the smell was the concern when being handed a letter with possible semen on it?
Its not good if your secret spy invisible ink smells
Smells like espionage!!
Apparently my bedroom when I was teenager smelt like espionage
😣😖
Both function as invisible ink and can be swallowed, but only lemon juice staves off scurvy.