Do most American straight men only care about holes sexually?  Or are they interested in sexual nuance? Asking because of porn.?

A hole is a hole. A guy might prefer a muscle hunk, someone in drag, bears, daddy types, twinks, furries, asians, blacks, Latinos, whites or trans - but what ever the case the hole is ultimately going to feel the same. It might be a little tighter in a younger person or with someone that take the time to do kegel exercises. But a hole is a hole. It’s the body connected to the hole that makes all the difference.