Who is Bobby and Valerie from Women and what is their importance?

Bobby and Valerie are a young married couple. Bobby works in a pornographic bookstore near Henry's home and moonlights as a photographer. Valerie is descibed as twenty-two-years-old with long blonde hair, blue eyes, and an attractive body. The couple remains married, but they also routinely and openly engage in sexual activities with various other partners. Bobby is a friend of Henry's.