What does Pyke open up to Karim about in Part Two, Chapter Twelve, and what surprising offer does he make?

In Part Two, Chapter Twelve, Pyke starts giving Karim a ride home after the acting meetings and starts opening up about his personal life. Pyke shares that he has an open marriage and actually tells Karim to go ahead and sleep with his wife as a reward for coming up with such a great character during rehearsal.