For the same reason that if you're a guy and have sex with a guy you're not bi-curious, you're gay. "Let's be honest".
This game has 4 scenes where Ayame has sexual interactions with a female, hence the lesbian tag.
Ayame has a solo scene with Adriana. She has a kissing scene in the couch. She has a scene where she's standing on top of Adriana who is sucking on her nipples while Dan penetrates Ayame from behind and finally there's the ending scene for the Robert path of the Garcias where not only they have physical but big emotional attachments.
If the game claimed to be "mostly lesbian scenes" I'd get your complain, but since it has more than zero lesbian scenes, it has the tag.
What if someone has zero tolerance for homosexuality plays the game, finds the scene and comes here complaining that it doesn't have the lesbian tag?
The tag is not here just so those who want to find it, can. The tag is there also so those who want to avoid it receive a fair warning. Some people do avoid gay scenes the same way I avoid scat or watersports or pregnancy for instance.
There's lesbians scenes, it's tagged as lesbian.
Elaborate enough for you?
So you're basically stating the exact same argument the other guy stated, "if a game has 1 scene even remotely close to girls being intimate, it should be tagged lesbian".
Tell me, why doesn't most games on this site have the lesbian tag then??
Literally almost all games I play, female or male protag, has at least 1 scene with girls kissing or something more. Whether it's part of a threesome or just foreplay before the big dick comes in. Those games still aren't tagged as lesbian.
So is that just terrible tagging on all those games then?
Or perhaps it has something to do with a threshold not being met?
You know, you could just go over to mangagamer or some other eroge selling site and see the same "phenomen". Lots of games there that have a few "lesbian" scenes, yet they aren't tagged as lesbian.
edit: I guess it comes down to guidelines for tagging for the specific site. I couldn't find any guidelines here at F95, but I have this quote from e-hentai.org:
(One of the biggest galleries for hentai manga)
"In general do
NOT tag something unless it has a fair amount of presence in a gallery. Anything found in only 1-2 images should almost never be tagged."
I think that captures well what I'm trying to argue, don't tag something which barely has any presence in the game. It misleads more than it does good.