I do understand your trouble and your disappointment. I do not understand the repulsion for that specific kind of content, but I do understand that one could be turned off, or worse by something he doesn't like.
I cannot fix the tags on this thread. I'm not the one who decided how my game would be tagged and have no power over it. Not that I thirst for said power in any way. I simply cannot add or modify anything on the tags or the original post.
Now, about the lesbian/bisexual content and the solo paths.
Eve and Cassie had sex. This is true for all paths. It happened, it cannot be changed or undone. It's in the past.
The future, however, is something else. If you are in a solo relationship with any of the girls, you can expect commitment. If you romance Cassie, she's not going to fool around with Eve anymore. That doesn't change what happened in the past, but you won't have to share your LI with another girl. I'm not sure it fits the definition of "non-bisexual LI" but you would be safe from bisexual content.
I like transparency. But I have a problem with spoilers. On one hand, I do understand the need for tags and find them very useful, but on the other hand, tagging can spoil the content and kill any surprise.
That being said, being spoiled should be a conscious decision made by the player himself. But I guess this is another debate entirely.
I hope I answered your question. Let me know if I wasn't clear.