**** is something made explicitly for sexual excitement. Whether it does or does not do it for a person really doesn't matter.
I can take pictures of daisies, and if that rocks Bob down the street's socks, it may feed his fetish but it's not ****. I can also take nude pictures of myself and call it art, and this too might arouse someone. If I didn't do it for the express purpose of getting someone's rocks off, it's not ****.
**** can, however, be made of almost anything. The real question you need to ask yourself about whatever it is your questioning, is what did the original author of the work intend it for?
I love **** lol