The school nurse gave that talk to my tutor group, with me present. It was incredibly hard to keep a straight face as she threw condoms and Dutch caps out to everyone, like a pantomime performer chucking sweets to the audience, as the kids in my class turned redder and redder shades of beetroot.
As she reached the last condom in her bag, she declared "This one's my favourite. It's called a 'Jiffy'. So, girls, if your boyfriend says that he's coming in a jiffy, watch out!"
;-)