How were they supposed to know you were writing porn? Do you have a big 'I'm Writing Porn" sign in neon hanging over you when you write porn?

Can you tell I enjoy typing "writing porn?"

And, yes, I get that the problem is that you were visibly working and they sat down with two noisy children next to you when there were plenty of places they could have sat that wouldn't have impinged upon your space, not that you didn't want to write porn in front of toddlers who most likely cannot read porn or anything else.