The sex shop

A woman shyly goes into a sex shop. She tells the man there that she's interested in buying a dildo but has no experience with these things.
"Well how about *this* one?" he asks. "It's gentle, not too big, and very popular with beginners."
"How much is it?"
"$50."
The woman buys the dildo and goes home.

A week later, she comes back with a small smile on her face. She tells the man she enjoyed the dildo and is looking for something new. After looking through a few she points to a larger one.
"Oh, that's a popular model for our more *experienced* clients. It's made of a better material and is more substantial."
"How much is it?"
"$100."
The woman buys the dildo and goes home.

Another week passes and the woman comes back. She looks all around before pointing to a colorful one behind the counter.
"Wow, what's *that* one?" She asks.
"You have quite an eye... This one is a more advanced model, made of stainless steel. It's much girthier and can stay warm or cold. They specially craft these in Scotland, hence the stylish tartan design."
"And how much is this one?"
"For a top-of-the-line like this? $250."
The woman hands him the cash and hurries out with her new toy.

A regular customer comes in after her and asks the man how he's doing.
"Great! I just got $250 for my thermos"