Quite right boxy . But let's not knock a joke just because of its age. There is usually someone who will hear/read a joke for the first time whenever it is let out. Jokes are like everything else - they come round in fashion. (:-))
O.K. - if you 'moulded' a bar of soap in water, with say - your hands, for quite a while it would wear away wouldn't it?
Think about it boxy and tell me what colour your face is now !!
Well yes, that's the way I was thinking, but being a bit dense tonight I can't see why the second nun would reply as she did.... but let's not go there, it's that I thought it was, hidey soapey!
It's the juxtaposition of "Where's the soap?" which is a question against "Wears the soap" which is a statement.
The first nun is asking a question about the current location of the bar of soap in their shared bath; the second nun is under the misapprehension that the first nun is sharing a confidence about what happens to the soap when it is used for *ahem* other purposes..........
Her response is an admission that she also uses the soap for that purpose.
(I think that's probably wrung every drop of humour out of the joke :o()
Can't say I'm surprised ttfn, you must have been through every minor and major body part and all that goes with them - tho as you're on this thread now, we didn't have "Free Willy" Soap" on the other one!