yesman

On my website which I use for work purposes, I have a hit counter.
I have just checked it, something I usually do about once a fortnight, but to my dismay someone has linked to my website from a porn website which includes a porno type blog, I didn't realise until I clicked the link, anyway, in the blog a lot of people have replied in the blog about links to their site also, my question is, How do they do it ? anyone any ideas ? Could I block it or should I just ignore it

Hope the above makes sense.