I would like to expand the wiki definition somewhat better for standing_sex, so I have a couple of questions. I'll be using a lot of my Flower Knight Girl H-scene uploads for examples, so bear with me:
1. Can leaning forward count, such as in post #2367851, or do they have to be upright?
2. There may be instances like post #3186166 or post #2367919 where it's impossible to tell if they're standing or on all fours. In this case, I didn't use the standing_sex tag. They're both against a table though, so it could be a hint that they're standing, but I can't be sure.
3. Does it apply if one character is standing, say the male against the bedside, while the other is lying on the bed, or does it have to be both characters standing?
4. How much of the legs would you want to see in order to be sure it's standing sex? I added some cowboy shot images due to context (like a table or the floor), but a cropped legs or full body composition would be much more accurate. A pose like post #2367894 is impossible to tell if she's standing or kneeling, so there's a lot of room for ambiguity and thus misuse of the standing_sex tag.
5. Do they have to be standing on both feet, or can standing on one leg like post #2693011 apply?