They've abstained from the dirty deed until this very night.
Just as Billy Joe is about to make love to his new wife for the
first time, she stops him.

"Wait, Billy Joe. I just thought you should know...   This
ain't just our first time... this here is my first time ever. I'm
a virgin.  I been savin' myself just for you."

"Whut you say, Mary Sue?"
 
"I said, I'm a virgin. One hunnert percent cherry. Just for you on
our weddin' night."

"Yore a VIRGIN??"
 
"That's right. Please be gentle."
 
"Gentle? Gentle my ass. I'm outta here!"
 
With that, Billy Joe pulls up his pants, hard-on and all, and
leaves his virgin bride lying alone and naked. He slams the door,
jumps in his pickup, and drives back home across the tracks.

"Paw! Paw! Wake up! Yore not gonna believe this!"

"Huh? Billy Joe, whut the hell you doin' here? It's 3am on yore
weddin' night! Why the hell ain't you and that purty new wife of yours
in a haystack somewhere f*ckin' like rabbits?"
 
"Paw, I wuz all set to do just that, when Mary Sue up and tells me
that she's a virgin!"
 
"A VIRGIN?"
 
"That's right, Paw. One hunnert percent cherry. As soon as she
told me, I got the hell outta there as fast as I could!"

"Well, son, lemme tell you, you did the right thing... Cuz if she
ain't good enough fer her own fam'ly, she certainly ain't good
enough for ours!"