The joke hinges on the misleading use of a homophone. Whilst the audience naturally assumes that the first nun is looking for the soap. Thus translating the homophone as 'Where's'. In fact the second nun is refering to how using the soap as a masturbation aid decreases the life of the bar through the increased deterioration caused by the frantic rubbing. Thus, the audience now re-interprets the homophone as 'Wears'.
I hope that clears things up.
Peace,
kowalski
Be authentic
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I went up to this girl in a club last night
I said to her
"You must be tired"
"Why?" she said "Have I been running through your mind all day?"
"No" I said
"I've just put rohypnol in your drink!"
Paddys wife goes to the doctor complaining that after ten years of marriage she had never had an orgasm. The doctor advised her to relax and use a fan to keep her cool during sex. Paddy refused to pay money for a fan and asked his mate if he would mind waving a towel while they made love, but still she didnt orgasm.
Next day she asked Paddy if they could swap over. and so paddys mate made love to her and after 20 minutes of the best mind blowing sex she'd ever had, she orgasmed. Paddy looked at his mate and said.... "and that, my old son, is how to flap a fucking towel".....