Musta been one of her magical concoctions, since it affected something in Limbo, much like her spraypaint does.
I think due to how Limbo works, people don't notice because they're stupid, and I mean that within the context of the game. Drinking Virility would lower your thinking capabilities and become a drone of the Limbo society and therefore not smart enough to question what it is that people do.I only thought it was weird when in the first mission Kat is on the pier with Dante in her spirit form but is also in the same place in the real world and there are people walking all around her. My first though exactly was what were the other people thinking when they saw her like that haha. After that it did seems like she could be further away from er body when projected. I guess it depends on how limbo effects the area. If it is very similar to the real world then she is probably closer and if it is drastically changed then she it probably a little distance away.
But there's still something that boggles me.
In mission 1, when Kat threw that bottle at the hunter, did she really throw a bottle?