Ever noticed how when sapphic girls obsess, even in cringy or obnoxious ways, about something they find sexy or sexual they usually frame it in terms of imagining a *person* or a *situation*, and straight and even to an extent gay guys tend to focus on the specific *thing* they find arousing?
No, this is by no means universal. But it's a pronounced general difference.
It's almost like the most important thing in a woman's sexuality is another person.