Here's another one that requires a little thinking ;)

*Not for young audiences!

DONATING CENTER

There is a man and a woman in a elevator in a donating center.

The man looks at the woman and says, "Why, hi there, what are you here for?"

The woman replies, "I'm here to donate blood."

"How much do you get for that?" The man asked.

"About 200 dollars." The woman replies.

"What are you here for?" She asked.

The man replies, "I'm here to donate some sperm."

The woman asks, "How much do you get for that?"

"About 500 dollars." The man replies.

A few weeks later they meet in the elevator once again.

"Oh, hey there again." The man says to the woman.

"Are you here to donate some more blood?" He asked.

The woman looked at him pointing at her mouth which was really puffy and shaking her head no.

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Hehe.... Lets do some goodwill and donate something useful! :D