Now I'm wondering about tags about specific, common sex acts like oral sex. I'm assuming most stories that have sex in them will have oral. So perhaps I'll only include that if I write a story where that's a focus or I go into great detail.
I've noted before that many tags have specific connotations. You don't include racial tags unless it's a stereotypical sexual relationship (ex: a white woman with a roomful of BBM). If you have a black or Asian character, I wouldn't bother tagging it. The same is true for oral. If you have no other sex in a tale about teenage explorations, then "oral" is descriptive, but if you've got dozens of other tags, it adds nothing.
Likewise, the incest specific tags (mother, father, daughter and son) are only meaningful if someone is looking for incest stories, but unless the entire story is specifically father/daughter, then I'd leave it off--"incest" is sufficient for incest fans to find it, or for those squicked by incest to avoid it.
The biggest problem with tag multiplication is when sex stories try to add new situations and new characters every chapter. As the encounters increase, so do the number of largely meaningless tags. I mean, who really cares whether there's a brief foot-fetish scene in chapter 78 but nowhere else in the story? If there's a watersport or diaper scene in the same chapter, those are major squicks, so you'd still tag it anyway.
However, for many stories, the tag multiplication simply isn't necessary. My 6 book "Catalyst" series was huge in chapters and word count, but had very few tags because the included sex was--for the most part--very generic, it simply wasn't a major factor in the story.
what is a universal squick code?
What if you write a story with a humorous scene. Imagine a guy getting drunk and passing out on the sidewalk. He's sleeping, leaning on a fire hydrant. Along comes a dog that does what dogs do when they see a fire hydrant. He lifts his leg and pees -- on the passed out guy.
Would that be watersports?
As I just mentioned, no, because the peeing isn't sexual in nature. Likewise, a story about a new family where the father changes the baby for the first time would not be labeled "scat". Sure, plenty of people find poop disgusting, but that's a humorous element, not a major sexual squick.
No particular reason you can't combine bestiality and watersports, In fact I can think of a couple of stories that do.
I agree. Since it's a sexual element, I'd include it. Again, for many tags, they're only meaningful if the reference is sexual, otherwise they're not. Who cares if a story has a brother and sister unless they're having incestuous sex? In that case, you can casually mention they're related in the story description, but otherwise the tags are meaningless to the story.