OK, here's the thing. I went along to Bing today and was going to look for a video, so with a blank search box clicked on the Video option. This is what I got:
UK Girls, Porn, Naked Men, Dogging, Sex, Vulva. Admittedly I was searching with a No filter option enabled, but I wasn't logged in. I'm not particularly bothered in some respects because these things can just be ignored, but I'm curious. Do they put up these options because they're popular video search terms, or because Bing naturally assumes that is going to bring in the clicks? Of course, having an unfiltered option means that I'm going to see stuff that I otherwise wouldn't - but I think that there's a difference between that and Bing actively pushing pornographic material in my direction!