is cyber sex cheating?

the thing with the amature porn got me thinking, i have always said if my other half looked at porn it wouldnt bother me aslong as i knew about it and he didnt hide it but i must admitt when i think about porn i think the glossy proper porn with girls who do it for a living, girls that he would never get to talk to and never get to meet but it never entered my head about amature porn.
for some reason i wouldnt be happy if my partner looked at that, i guess cos they are just the girl next door, you can get to talk to them and i would proberly guess meet them as they cant be the kind of girls who care much about there pride.
i was wondering if my friends other half has met one of these girls.
it would all make sence.
how would any of you feel if your partner looked at amature porn?
if you are fine with them looking at normal porn would you feel different about amature porn like me?
or am i turning in to a prude?