The Unbearable Lightness of Being Part 4, Chapter 1 Summary
(We now jump back in time to when Tomas and Tereza are still alive.)
Tereza comes home late one night and gets into bed with Tomas. She smells something curious on his hair, and soon realizes that it is the smell of another woman's sex organs.
The next morning, Karenin wakes up with the six o'clock alarm ready to start the morning ritual (in which she takes a walk with Tereza and fights with Tomas for a roll). But this morning, Tomas is busy listening intently to the radio.