Women hate sex simply because they are lousy at it.
You are one of the few who will see this.
Sure, there is the physical pleasure, but there is a deeper need that is being satisfied.
Generally, the sight of a partner really enjoying themselves will banish any weird feelings someone might have about getting called back to base mid-dive.
It can help you say, 'stop, go, yes, more please' - without sounding like a traffic cop.
Many years before I got together with my boyfriend, I had a sex thing with this guy that I thought was relationship-material.
After all, we each have only the word text boxes and crappy jpegs and clever not so clever user names to show for ourselves.