Yeah, I've realized that my insistence on proof in my previous comment to you implies an assumption that people are 'straight' until proven otherwise, which is very problematic and contributes to a lot of queer erasure in history. However, I dislike that the discussion is typically framed in a binary way, in this case heterosexual/homosexual, and it's actually that rigidity that prompted my insistence on proof previously. So really, there's no perfect way to go about discussions like this.