Why do people insist that Jake Gyllenhaal is gay?

Jake Gyllenhaal at 'Prince of Persia' Press Conference in London

Jake Gyllenhaal as Jack Twist in "Brokeback Mountain" (2005)

Q: "Why do people keep insisting that Jake Gyllenhaal is gay? Is it because of Brokeback Mountain? Certain blogs out there label actors as "gay" as if they were talking about their eye color, but isn't the goal to keep everyone out of everybody else's bedroom, actor or no actor? I never understood how people can't see that labeling someone as gay (who isn't) even if you’re gay yourself is homophobic and harmful. Basically you're proving that there is something wrong with being gay by using it as a weapon. – Cassie, Austin, TX
A: Fantasy wish-fulfillment aside, I’ve always thought it was lazy and simple-minded to label an actor “gay” just because he’s played a gay role. As I’ve said many times, if you want to know who’s gay and closeted in Hollywood, look to the actors who have never played a gay role.Jake Gyllenhaal and Heath Ledger in Brokeback Mountain (2005)

When it comes to Jake Gyllenhaal, it’s particularly annoying because I honestly believe the guy deserves a lot of credit for taking that role in Brokeback Mountain, especially since it involved him being on the “receiving end” in the tent scene. In 2005 America, for an up-and-coming lead male actor, this was a pretty big deal (and I’m completely serious about this).But yeah, all the gossiping and rumor-mongering about Jake just proves the most cynical people in Hollywood right: that American audiences are too stupid to separate an actor from the roles he plays. And from gay blogs, no less? Sheesh.
Anna Paquin (who came out as bisexual on April 2010) shooting a Marie Claire advertisement in Easthampton

Still, I disagree with you a bit about the ultimate “goal” of the GLBT movement. Brokeback Mountain tent scene aside, being gay isn’t really about sex. There are two parts of being gay: the private part, which is what we do in our bedrooms (and kitchens and living rooms and hot tubs, if we’re lucky); and the public part, which is about relationships and rights. The only part that concerns heterosexuals is the second part". Source: www.afterelton.com