[Elisa]

I'm game:

Jake Gyllenhaal - bisexual
Colin Farrell - bisexual
Hugh Jackman - straight
Matthew Perry - straight
Matthew Broderick - gay
Josh Hartnett - straight
Orlando Bloom - straight
George Clooney - straight
Sean William Scott - not familiar with him
Johnny Depp - straight, but experimental
Matt Dillon - straight
Matthew McConaughey - straight
Justin Timberlake - straight
Ryan Seacrest - straight, but metrosexual for sure
Brad Pitt - straight, but experimental
Hayden Christensen - bisexual
Ryan Phillippe - straight
Matt Damon - straight
Jared Leto - bisexual
Tom Cruise - bisexual
Kevin Spacey - gay
John Travolta - straight
Matt LeBlanc - straight
Jeremy Piven - bisexual
Richard Gere - straight
Eddie Murphy - bisexual
Terrence Howard - straight
Jude Law - straight, but experimental
Will Smith - straight, but experimental
Harisson Ford - straight
David Schwimmer - straight
Ben Affleck - straight

*by experimental, I mean they're straight, but willing to try same sex though probably not into it or necessarily bi.

*The one that really throws me is Hayden Christianson. I'm not sure what to think of that guy so I'm going with bi.

Let me throw a few singers into the mix:

Steve Tyler - bisexual
Rod Stewart - bisexual
Jon Bon Jovi - straight
David Bowie - bisexual
Billy Joel - straight
David Lee Roth - bisexual
Mick Jagger - straight, but experimental
the late Michael Hutchinson - straight, but experimental
Axl Rose - straight
Prince - gay
Bono - straight
Paul McCartney - straight
Michael Jackson - hee

Sinead O'Connor - lesbian
Joni Mitchell - bisexual
Joan Jett - lesbian
Madonna - bisexual
Jennifer Lopez - straight
Bonny Rait - bisexual
Linda Ronstadt - lesbian
Chrissie Hynde - bisexual
Courtney Love - bisexual
Grace Jones - bisexual
Cindi Lauper - straight
Whitney Houston - straight, but experimental
Janet Jackson - bisexual
Mariah Carey - straight
Sheryl Crow - bisexual