Ya know, I went out to a bar once and saw this beautiful blue-eyed brunette. Got her a few drinks and one thing led to another...she did not ask me to enumerate which chicks i've been with - she just expected me to make her a woman...
you get the picture
Being asked for code samples in an interview is bullshit. It has never happened to me.
Go find another employer, one who will discuss previous projects, pitfalls, solutions, science, the passion behind what you like to do and what you'd bring to the organization, stuff that demonstrates your ability and skill. No need to kiss and tell.