Same situation but the father only has a son. The salesman says “I think I’m in the wrong joke.”
Frenchmen going home to their wives after sex.
I don’t get this joke 
Bridal - bridle
The first naughty joke I ever heard (and the first naughty joke LOTS of peopple ever heard, in grammar school) end with the punchline:
“Me Chinese, me play joke. Me make pee pee in your Coke.”
A few other VERY well known punch lines:
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“Welcome to Jamaica, mon, have a nice day.”
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“And that’s not my finger, either.”
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“Well, show her your nuts!” “Okay… WAAAAHAAAAHHHAAAAAHHAA!”
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“Block that kick! Block that kick!”
A John propositions a hooker.
Hooker: For $200 I’ll do anything you want.
John: OK, paint my house.
“Here. Iron this.”
“No, I want it twice in the dumpster.”
“Yes, but what are you going to do?” (my all time favourite)
And the second salesman says, “I’m full. I just ate all that hot, buttered corn.”
Damn you to heck sir. I just fired that line into Google and only one hit came back…with only the punchline.
Can you spoiler the setup please? I gotta sleep tonight.
Death By Snoo-Snoo!
Do you smoke after sex?
No, but I steam a little.
How does a French woman hold her liquor?
By the ears.
What does Paris Hilton (ie the starslut du jour) put behind her ears to attract men?
Her ankles.
Now where’s that Eskimo woman I’m supposed to wrestle?
“I don’t know you naughty boy, I’ve never Kippled”.
I must say I haven’t heard this one in a very long time though.
“Would you…study?”
Out of all these jokes, I’ve only ever heard six, including the OP’s. Just thought I’d weigh in.
The aristocrats.
One variation is found here.
The prostitute says: Are you done, yet?
Your girlfriend says: Are you done, already?
Your wife says: The ceiling needs painted.
Plus, this classic punchline:
I got a fuck for a duck, a duck for a fuck, ten bucks to duck a fuck, and I’ve still got the fucking duck. 
Something tells me this is regionally associated with the area near Pittsburgh…
One of us is being whooshed.