Who is Jacqueline from Stone Butch Blues and what is their importance?

Jacqueline is Butch Al's femme, a "pro" (prostitute). She is also a role model for Jess in that she is the perfect description of a femme - long nails, high heels, and a sweet demeanor. Butch Al teaches Jess about the dildo, but Jacqueline says it's not how you use it that counts, it's the thought behind it.