[M/s] I have a "reality vs. fantasy" question for those that love incest but don't actually fantasize about their own family members.

How closely does your fantasy incest lover resemble their real-life counterpart? For example: if you are a M/S kind of guy, do you enjoy porn with women that have the same hair color, body build etc as your true Mom? Interested in replies about any type of incest. Would love to hear from women, too!