It sure isn't something you'd say out of the blue. But it's not like it would kill your social image as much as he implied it would.
In most cases, people just wouldn't react much as they are the same >_>
Regarding Inaba telling Taichi, I do not see her lying about it. It's just that it never was not a big deal. Private matter sure, but not as big of a deal as it is for Taichi. But telling him, she also helps Taichi getting over it, kinda like a thanks for his help.
Funny was how Inaba's fears were totally unfounded. Even Taichi was suprised at how the others came over it as if it was almost nothing and just moved on to other daily life topics
Now regarding the story, we do explore the girls' problems, but for now we get nothing about the two boys. I guess they'll probably need a great deal of help. Particularly Taichi, the selfless freak.