A couple going home one night in a car after a dance stop in a country lane for a snog - one thing leads to 'the other', but she hesitates and tells him he'll "have to wear one"
"One what", he asks?
She explains what she means and he looks puzzled saying, "I've never heard of one of those - where can I get one ?"
"As it happens" she says, "I've got one in my handbag"
"What do I do with it" he asks ?
Sighing, she takes it out, holds up her thumb, rolls it into place and tells him "like that" - then she takes it off and hands it to him - "now you do it".
They get down to the business and, after a few minutes she says, "Are you sure you've got it on right - "I'm all wet".
"I think so", he says, holding up his thumb
Jim Carroll