what are the sins in chapter 2 and 3?

There are quite a few "sins" here. When working with the Street Sweepers in a road north of the city, Equality 7-2521 sees Liberty 5-3000, a woman from the Home of the Peasants, and he is instantly attracted to her tall, blonde beauty and her fearless, guiltless expression. Equality 7-2521 knows that it is forbidden to have preference for one woman. He also gives her his own pet name, the Golden One. An individual name is considered a sin as well. Equality 7-2521 is sexually attracted to her but knows it is a sin to think about sex outside of The Time of Mating (kind of like mating season except for humans!)