Season 4: Episode 51: Defining Moments
Carrie goes barhopping with Big and finds that their relationship as "friends" has never been better. Charlotte and Trey are enjoying themselves as well - having steamy sex in coatrooms and other public places around the city. However, Charlotte starts to wonder where she and Trey are headed. Out on the town again with Big, Carrie is drawn to jazz musician Ray King, who flirts with her and gets her number. Big is noticeably annoyed and Carrie realizes they need to define their relationship.

Meanwhile, Miranda is a little freaked out when her date Doug pees in front of her the morning after their first night together. Miranda decides that she should go with the flow, and tries peeing with the door open herself. However, Doug takes the no-boundaries thing too far, subjecting Miranda to an "open door dump" after which Miranda quickly dumps him.

At Charlotte's gallery opening, Samantha meets Brazilian artist and lesbian, Maria. Maria, a "relationship person" is attracted to Samantha, but Samantha says they should stick to being friends as she's NOT a relationship person.

On Carrie's first date with Ray King, they run into Big and his supermodel date, plus Samantha and Maria. Big is clearly being territorial about Carrie, and Samantha tells Big to "back off." At the end of the evening, Big is distant with Carrie, leaving her confused. Maria tells Samantha they can't just be friends and Samantha decides to try being in a relationship with a woman. Carrie and Ray share a passionate goodbye kiss and Carrie ponders the notion that "what ultimately defines a relationship is another relationship."