The sign reads:

"Sex Frogs!

Only $20 each!

Money Back Guarantee!

Comes with complete instructions."

The girl excitedly looks around to see if anybody's watching her.
She whispers softly to the man behind the counter, "I'll take one."

The man packages the frog and says, "Just follow the
instructions."

The girl nods, grabs the box, and is quickly on her way home.

As soon as she closes the door to her apartment, she reads the instructions and reads them very carefully. She does exactly what is specified:
 1. Take a shower.
 2. Splash on some nice perfume.
 3. Slip into a very sexy nightie.
 4. Crawl into bed and place the frog down beside you and allow the frog to follow its training.

She then quickly gets into bed with the frog and, to her surprise, nothing happens! The girl is very disappointed and quite upset at this point.

She rereads the instructions and notices at the bottom of the paper it says "If you have any problems or questions, please call the pet store."

So, the lady calls the pet store. The man says, "I'll be right over."

Within minutes, the man is ringing her doorbell.

The lady welcomes him in and says, "See, I've done everything according to the instructions. The damn thing just sits there."

The man, looking very concerned, picks up the frog, stares directly into its eyes and sternly says, "Listen to me! I'm only going to show you how to do this one more time!"