Trust?

A businessman and his secretary, overcome by passion, go to
his house for an early afternoon "quickie."

"Don't worry," he purrs. "My wife is out of town on a business
trip, so there's no risk."

As one thing leads to another, the woman reaches into her purse
and suddenly gasps, "We have to stop, I forgot to bring birth
control!"

"No problem," her lover replies. "I'll get my wife's diaphragm."

After a few minutes of searching, he returns to the bedroom in
a fury. "That witch!" he exclaims. "She took it with her! I
always knew she didn't trust me!"