Oh lord. There's a lot of slashiness in The Invisible Man ::points to icon::, but the real No Heterosexual Explanation Moment is in "Flowers for Hobbes". Basically Bobby says something about being Superman (it's a long story). To which Darien replies, "You're Superman? I'm the invisible man. Wow, we just get Wonder Woman, we could really party, you know what I'm saying?"

What makes this a NHEM is the existence of this joke. I mean. I challenge ANYONE to find the heterosexual explanation for that.