A man meets a beautiful, sexy girl. He really desires her, so he invites her to a movie, and she tells him:
"Listen, if you're looking to sleep with me, then there is no need to get me dinners, movie evenings and all that. Just buy me a good Swiss Army knife."
The guy thinks. It's true, he's not interested in something long-term, so he buys her a good genuine Victorinox.
They come to her home, she opens a big chest standing in a closet, and puts his knife there. The guy sees that the chest is half-filled with such knives already. Then she takes him to her bedroom for a wonderful night together.
The next morning, they're sitting at her kitchen, drinking tea, and he asks her:
"Can I ask you a question? What would you need so many knives for?"
"You see," she explains. "I'm young now. I'm beautiful. I have no trouble finding guys; in fact, they're the ones chasing me. But I know it doesn't last forever. One day, I'll be older, gray-haired, I'll be the one looking everywhere for a piece of love, and then... do you have any idea what a young man would be willing to do for a good Swiss Army knife?"