I find myself appreciating the aesthetics of the human body if I look at a static photograph of naked people, no matter what they're doing or how subjectively attractive or not they are. It doesn't really rev my engine. Streaming video is umm, a different matter. Who doesn't like a little porn
And looking at my S/O is totally different, because that's love plus lust plus warmth plus affection plus happy memories, etc. ... a whole soup of strong, good emotions and memories wrapped together
In terms of porn, since you seem to be curious plifter, I'll throw in. I hate fake porn, the perfect hair, teeth, big plastic boobs, fake moans and gasps and the obligatory facial, eww.
Amateur stuff can be fun ... IMO, if the participants look realistic, and look like they're really having fun, for real, it gets my attention.
Romance, story lines ... I know some women like that, but I find the bad acting dreadfully distracting. If I want story and romance I'll watch "9-1/2 Weeks" or some other Hollywood blockbuster with soft core tendencies.