At the beginning, I apologize to you for my clumsy English because I'm a student in Japan, and what I'm going to type is likely very long...
(sometimes used Google translation)

I wonder that some pictures with the yuri tags are NOT suitable to show the true meaning of yuri.

In fact, "Yuri" is a Japanese word that means the plant lily, but in Japanese coterie, it often does "girls love" metaphorically.
In these days, girls love-lover males are called "yuri-danshi". (danshi = male)
As one of Japanese yuri-danshi, I think that 'yuri' is only the pure 'GIRLs love' including lesbians, and that there is no need for male at all.
(There is a comic "yuri-danshi" in Japan, the male main character who is a yuri-danshi says,"I think therefore yuri is, without the need for me.")

On Gelbooru, the yuri tags has been used with the pictures that 2 or more girls get along with each other, such as touhou or k-on!.
It is correct to use it like this, but there are some images with this tag that girls stare here as if you could choose one of them, or that they sandwich a penis with their breasts.
I insist that the girls in these pictures are NOT lesbians BUT bisexuals, so that these situations can NOT be called 'yuri'.

Can I remove the 'wrong' yuri tags? If it is okey, they will disappear since yuri-danshies all over the world would agree with and help me. ;)

My argument is all over. Thank you.

P.S.(unrelated)
Tags 'hyaku_gou_no_kan_...' is probably the mistranslation of 'yuri_no_yakata_...'
Yuri is denoted as 百合 in Japanese Kanji, which only when these two characters have been lined, and we read them as 'yuri'.
Moreover, only when some modification of Kanji are placed in front of 館, it is read as 'kan'. (cf:紅魔館 kouma-kan)
So, just 百 would be read 'hyaku', just 合 be 'gou' and 館 be 'yakata'.
Only 16 pics are on Gelbooru, became so concerned about it, I mentioned it.
Above, the term was Japanese Japanese language courses. ;q

Sure go ahead, that would be pretty helpful if you removed the tag from bisexual pictures.

Please, do it. :)

Good luck in school.

Please bear in mind that images showing girls just getting along as friends don't qualify for the yuri tag either per this site's tag definition: the girls need to be showing some form of intimacy or sexual interaction.

gelbooru.com/index.php?page=wiki&s=view&id=11

I see too many images where it's a group of girls who stand close and it's given the yuri tag just because the girls are standing close to each other. If they aren't groping each other or looking at each other in a clear way that shows intimacy or desire, then the yuri tag doesn't apply.

tee-hee thanks! when i search yuri i don`t really want to see any penisis. this helps alot

Keep in mind that having men in the images doesn't keep off the yuri tag. If the men are not directly involved in the sexual action between females in the image, the yuri tag still applies.

Just in case. gelbooru.com/index.php?page=wiki&s=view&id=2985

The wiki entry of the threesome tag.

I'm very grateful for you, asaumi-san! I've noticed this as well and when new yuri picture appears where males take part I have removed yuri tags as well. Thank you for taking this issue up!

while, yeah but this still helps.

I like the point you make, but seems that some people disagree with you.

Namely this picture that has bisexual tag is constantly getting yuri tag added as well by Daniruu.

gelbooru.com/index.php?page=post&s=view&id=1443945