Phallic Friday - mental or physical?

Today's question is one I wrestle with quite a bit.

Is the turn on from sex, mental or physical?
I lean towards it being largely mental. Why? Well, sometimes if I read or watch or listen or think, without touching any body part, I can be aroused. I have read scenes that have me squirming I'm so aroused from just reading (no body parts touched). It's rare that it goes further than squirming but it has happened. So without anything physical occurring, there's a turn on from sex.

But, my hesitation with my answer is from anecdotal claims that you can orgasm without enjoying the sex...but I wonder if there's a mental component to that even. I have never experienced this.


So, do you have thoughts on whether sexual enjoyment largely comes from the physical or the mental?