Ah, I didn't quiet get that from what you said, sorry.
I suppose they would be upset and maybe hurt that you haven't told them about it, but hopefully they will understand that it's not exactly the type of job you tell your parents about, regardless if you are straight or gay.
It's good they want to talk , I'm assuming they are about my age, so once they get over the shock and you can tell them that you are looking after yourself and keeping safe, I'm hoping they will come around.
Maybe let them read some stuff on this site? So they can understand the industry you are involved in.
xx