How we cite our quotes: (Chapter.Paragraph)
Quote #1
Georgia might have been one of the girls Richard had had an affair with, Therese supposed. He had once mentioned about five. (2.47)
They're not as prudish in the 1950s as they were in earlier decades, but men are still more open about their sexuality than women are. Richard is more sexually experienced with the opposite gender than Therese is.
Quote #2
It was a strange relationship, she supposed, and who would believe it? Because from what she had seen in New York, everybody slept with everybody they had dates with more than once or twice. (2.62)
Here we see that it's also socially acceptable for young people of both genders to have sex before marriage. This isn't quite the sexual revolution of the 1960s, but it shows the culture leading up to that moment.
Quote #3
She remembered the first night she had let [Richard] stay, and she writhed again inwardly. It had been anything but pleasant. (5.62)
At this point, Therese isn't sure if she is sexually different—the word homosexual is never used—or if it's just Richard who is icky. As she becomes more attracted to Carol, she realizes that it isn't personal with Richard; it's men in general who don't interest her.