When the regular size won't fit. This doesn't strike me as an aphrodisiac, however:
The system works a bit like a car wash. The man put his penis in a chamber and presses a button to start the jets of liquid latex, sucked from a detachable cartridge. The rubber dries in seconds and is later rolled off and discarded like a conventional condom.
The aim is for the process to take just 10 seconds but at present the latex drying time is around 20 to 25 seconds. "We're working to shorten that time," said Krause.