I'm still not sure about posting details of an adult search engine, but have decided that I will, mainly because I'm interested in search, rather than pornography, and I believe that if you want to see it or not you're all old enough to make up your own minds. Boodigo is a search engine that looks for material that most of us are not particularly interested in, but it says that it does it in an ethical way. This primarily means two things - firstly it doesn't store any information on your IP address, keeping your privacy and secondly it doesn't link to any sites that contain nasty malware or viruses.
So far vaguely ok. Next, I had to try a search and luckily 'phil bradley' is quite a good one in this instance, because I have a namesake who is a gay porn star. (Actually I don't think he is any longer, but he was, and there are enough images of him about to make it an appropriate search term.) The results were rubbish. No phrase searching, it was pulling up pages that had 'phil' in them by itself and 'bradley' in others, there were lots of pages about Phil Collins - not entirely sure how he'd be feeling about being picked up by an adult search engine.
So it might be ethical, but as a search engine, it's absolute rubbish.