Yes, with one tweak: it's because I find the person sexually attractive. It's not the kind of attractive that urges me to start "socializing" with the person, for example; "trust", "friendship" etc are not my first impressions. My first impression is that I'm horny as heck.
> That would quickly lead us to classifying 90% of everything on the internet as sexual, as there is a wide range of stuff that makes people aroused, like people having sexual attraction to cars.
I'm confused by your repeated allusion to "sexually aroused by cars"; I've never heard of that. Other than that however, 90% of everything everywhere (not just on the internet) is sexual. Absolutely everything is advertized with attractive women (clad to various levels of decency, dependent on the medium), precisely because sex is the #1 drive for men, and so "sex sells" (to men). It may be subliminal, or it may be "in your face", but a huge proportion of all ads is sexual.
> Maybe being able to discern our own perspectives and sexual preferences from a wider labeling of content might be beneficial?
Oh definitely. I have absolutely no personal interest in the "content labeling" debate, as I've not been a consumer for several years now. It's just the fine article's qualification of the picture -- which the author tried to use as a representative, for driving the point home, IIUC -- that I disagreed with.
Also, my English could be failing me here (I'm not a native speaker): you seem to use "sexual" and "arousing" as two (at least somewhat) orthogonal concepts. To me, they mean the same thing: "stuff that makes me horny". If I cared about cars, I guess I might call some cars "exciting", but that's not "arousing". Arousal implies excitement, but not the other way around, in my vocabulary.