according to the wiki page for sex, it's "sexual activity between two or more characters."

a lot of what's on the sex tag is actually solo characters jacking off; some of this might be due to implications like fellatio to the sex tag and the confusion between terms like autofellatio

the wiki page for solo says that "tentacles only count as a character if they are attached to a visible creature (octopus, etc.). That is, a picture of just tentacles would actually be tagged with zero_pictured." this doesn't contradict the wiki page for sex, but the tags for "sex" and "solo [+] masturbation" are incompatible according to their respective wiki pages, so what should be tagged in the case of an unseen tentacle monster?

most of the "solo masturbation sex" combination is just tagging errors.

in sum, it would be good to clear out these errors while talking about what to do with the tentacles/unseen_character conundrum. personally i don't see tentacles being masturbation in the strictest sense.