You are hardly waving around the panties or carrying them on your head. It is in your backpack, so she won't see it. That's what I mean.

Also your heroes most likely don't know, who those panties belong to. We as the player have the information, so we know it could be important. But our chars will hardly smell, who they belong to. At least I can't remember, if they were specially marked or got a name sticked into them.