Fred went to his psychiatrist and told him that he suffered from anxiety because he thought he was gay.

"What makes you think that?" asked his psychiatrist.

"Because my father was gay," replied Fred.

"Well, the condition is not passed on," said the psychiatrist.

"But my brother is gay," insisted Fred.

"Well, that doesn't necessarily mean that you are," said the psychiatrist.

"My Uncle Jim and my cousin Bob are gay, too," Fred said.

"Hell," said the doctor. "Doesn't anyone in your family have sexual contact with women?"

"Yes," replied Fred. "My sister does."