Mr. Cosby said he gave her one and a half tablets of Benadryl to relieve stress, they kissed and had sexual contact. Her lawyer said she believed it was a much more powerful drug.

Some time later, after Ms. Constand had moved home to Canada, Mr. Cosby spoke with Ms. Constand’s mother on the telephone. The mother, he said, was upset about what her daughter said Mr. Cosby had done, describing the experience as “a mother’s nightmare.”

In the deposition, he said he was worried that Ms. Constand’s mother would think of him as a “dirty old man.”

During the call, Mr. Cosby told the deposing lawyers, he wanted Ms. Constand to tell her mother “about the orgasm” so that she would realize it was consensual.

“Tell your mother about the orgasm. Tell your mother how we talked,” he said he remembered thinking.