I think it's funny; number two. Because if you think about it, people who are straight don't think and decide about being straight. Most of the time they just assume they are, and then they think, "Am I gay/lesbian?" or "Am I bisexual?"
This is a bit random, but one time I was with my brother, right? He randomly asked (we were watching previews of the first season of A Shot At Love With Tila Tequila) and he's like, "How do you know you're straight?" I said, "I don't know; I'm bisexual so..." And that's how I came out with being bisexual, but it really made me think: Why do you need to question yourself, asking if you are bisexual or homosexual, but you automatically think you're heterosexual?
I think it's strange, but interesting.
And I like this 'questionnaire' thing. I find it really funny. xD
I thought that was pretty cool. I remember once in high school we were debating about gay marriage in journalism class. I was on the pro team and this guy on the opposing team asked this girl on my team (who's a lesbian) how she knew she wasn't heterosexual.
He said "how can you say you're not into men if you've never even slept with a guy?"
So then I said "Have you ever slept with a guy?"
And when he said "No." I asked "Then how do you know you're not gay?"
That made me laugh just because I could imagine some... severely homophobic person being asked these questions and like... shitting themselves. And just... some heterosexual people, who maybe aren't homophobic, but a bit... clued out, being completely off-put by it.