happy_sex: Sex in which the female participant is noticeably cheerful. Penetration isn't necessary, any sexual practice counts.
sex: Pictures depicting the act of sexual intercourse. Only use this tag for actual vaginal or analpenetration. Don't use it for oral sex, paizuri, or other acts that don't involve penetration.
my personal opinion regarding the tag sex is to mark it ambiguous and decommission it in the future. that will of course remove the implications and other alias like on_top, fuck, and fucking. there are more specific tags that describe specific 'sex' and more useful, so we should go by that instead, i guess.
There is not any other tag described as "Only use this tag for actual vaginal or anal penetration." (vaginal, anal and penetration don't count; they have different purposes)
i would assume some of the confusion might be attributed to how our wikis are currently defined (vs. the past and actual practice/understanding of users) and current aliases like (anal and anal_sex but no vaginal and vaginal_sex).
as of now, the sex tag is too broad/polluted to be useful and probably causes more headaches and problems than being helpful in locating posts.
by the way, how exactly is "actual vaginal or anal penetration" in a post? should the penis be still visible, at least a few centimeters of the shaft from the male body? how about those posts where the thigh obscures the pelvic regions of the participants and it's hard to tell if they're doing 'actual' sex or just rubbing together or just about to enter?
instead of looking for an umbrella for both the actual vaginal_sex (penile-vaginal penetration) and anal_sex (penile-anal penetration) we could just use both tags. anal_sex vaginal_sex is still good enough even for basic members. or if there's really a need to use just one tag, i have nothing against sexual_penetration as suggested above or if there's an alternate term.
and in just case that we are going for changes like using anal_sex as penile-anal penetration instead of any anal penetration, we should remove the alias of anal and anal_sex or redefine the wiki.
instead of looking for an umbrella for both the actual vaginal_sex (penile-vaginal penetration) and anal_sex (penile-anal penetration) we could just use both tags. anal_sex vaginal_sex is still good enough even for basic members. or if there's really a need to use just one tag, i have nothing against sexual_penetration as suggested above or if there's an alternate term.
vaginal_sex and anal_sex are fine with me, particularly if the act is visible, not merely implied, ambiguous or imminent.
Populating them does not mean having to nuke (or clean up) sex now. But sexual_penetration (or a synonym) could be their umbrella.
I think we do need an umbrella tag as many posts are ambiguous, either by censoring: post #392662, post #122984, position: post #1149906, post #1163437 or artist lack of anatomy knowledge (please dont make me find examples).
Trying to sort out all posts where the characters might be having intercourse from the ones where that is clearly visible is borderline impossible and probably the reason people dont want to touch this subject.