It was child pornography at lot of so called FREE sites have darker sides to them when you press GO! I just wasn't impressed, just thought most would think it was something nasty, without me going into detail.
Wow, I have never seen anything like that there. It sounds like their ad server has most likely been hacked. That is usually the case when porn and viruses appear on respectable websites and that site has always been respectable for many years. And it is not really a free website. It is only free for conversions if you don't mind putting up with waiting for the ads. Paid subscription removes those annoyances.
But thanks for telling me what the actual problem was.