I have remedied this issue for a few posts, however, 26 results remain when searching 'h0rs3 solo sex', all or most of which are improperly tagged with 'sex' as no sexual interaction between multiple characters occurs. Some are tagged specifically with 'sex' for unknown reasons where others have had 'sex' implicated as a result of improperly tagging 'fellatio' or 'penis_lick' instead or 'autofellatio' and 'auto_penis_lick' respectively. One instance I have not remedied is improperly tagged with 'sex' due to being improperly tagged with 'fellatio' as a result of an implication from the tag 'oral_knotting'. As the post indeed contains a character orally knotting himself yet there is no 'auto_oral_knotting' tag I'm unsure of how to proceed in this particular case.
I would remedy the remaining posts but it's 2 in the morning and I lack the patience to go through the rest, so I thought I'd bring attention to this in case anyone feels inclined to fix it.