"How to use condoms" joke

A woman was driving through the countryside late at night when her car
broke down. Not knowing anything about cars, she started to walk. A
mile down the road, she came to an old country farmhouse and knocked
on the door until two young men came out.
"Kin we help ya, miss?"
"Yes, my car broke down about mile back. I wonder if you could drive
me to the nearest town so I can get a tow truck?"
"Well, now, the town's all shut up right now and don't open back up
until tomorrow mornin'. But ah'll tell ya what, miss, mah brother here
an ah'll tow yer car over to the farmhouse and you kin spend the
night here with us."
The woman thought, "Well, I really don't have a choice. Besides, I
can handle myself," so she agreed.
After the two brothers towed her car back to the farmhouse, and they
were getting ready for bed, the first one said, "Yah know, miss, we
only got one bed in this here house, so ah'm afraid ya'll have ta sleep
with us."
The woman thought about it, and consented. As they were taking their
clothes off, the woman said, "By the way, you DO have protection, don't
you?"
"Protection? What's that?"
"You know, condoms."
"Well, what're they for?"
"It's so I don't get pregnant."
"We're simple country folk, miss. Ah'm afraid we don't know about those
things."
"Well, it just so happens that I have two here in my purse. Here, put them
on."
"Hmm... well, all right."
The three of them got into bed and did their thing all night. The next
morning, the brothers drove the woman into town, where she got her car
repaired and drove off. About a month later, the two brothers were
sitting out on their porch watching the sun set, when the first one said,
"Hey, d'ya remember that lady that drove through here about a month ago?"
"Yep. She was real good, wasn't she."
"Yep. Say, do you care if she gets pregnant?"
"Nope."
"Well, then, let's take these durn things off!"