Virgin

There's this really old guy at an old-timer's dance, and the problem is that he hasn't scored any sex for a long time.
He'd been dancing with all the grandmas all night, but still hadn't scored a root.
Frustrated, he approached an old grandma and said :
- I'm having no luck scoring a woman. How about coming back to my place for a root? I'll give you 30 bucks !
She says :
- I'm willing, let's go.
They get back to his place and after a bit of foreplay, they head for the bedroom.
He's loving the sex, and can't get over how tight she is for such an old woman, maybe she's a virgin.
After the whole performance, he rolls off of her and says :
- Wow ! Lady if I had of known you were a virgin, I would have given you 100 bucks.
Surprised, she says :
- If I had of known you were actually going to get a boner then I would have taken my stockings off !!