Head on or inserted in a painful place? Either works for me.
Personally, like you, I enjoy admiring the female form in various states of undress - prefer some clothing as I am a big fan of keeping the mystery going. Watching someone having sex though is a waste of my time - far better to go off and bother the wife.
Having said that though, I got no huge problem with people looking at porn. Their souls, their choice. Not something that is vital for the President to deal with. Heck, you can hardly watch a movie now without the obligatory and fairly graphic sex scene cropping up.
One thing surprised me. There is a thing called ethical porn (had to research it for an article). Reading that term, talk about a mental disconnect! Took me a day or so to even process the idea that porn can be ethical.