To understand Peter Sarsgaard's attitude about sex on the screen, look no further than the central scene from his most recent role, bisexual graduate student Clyde Martin in 2004's highly acclaimed but Oscar-snubbed Kinsey. In the sequence in question, Martin tenderly seduces his mentor, Dr. Alfred Kinsey (Liam Neeson), the post-war pioneer in sexual research who discovered that people have more sex with more diversity and less monogamy than anyone had previously believed. After the two men have spent an evening culling harrowing stories from the patrons of mid-1940s Chicago gay bars, Martin casually undresses in front of Kinsey back at their hotel room until he's standing before him completely, full-frontally nude--as Kinsey talks to his wife, Clara (Laura Linney), back home at Indiana University. (Martin will eventually bed her as well.)
Now, some male actors whose careers are just starting to really take off might seriously brood for days on end over the decision to bare it all; Sarsgaard loved the idea. "It makes so much sense that I would not only be nude but just be nude a second too long," the 33-year-old observes with real pride. "It doesn't mean I'm hitting on him, but if I just do it a second too long, I can check and see [if Kinsey is interested]. I liked that it would have a dramatic meaning, that it would be active nudity."
And if audiences thought the fiercely passionate kiss Sarsgaard shares with Neeson at the end of the scene was gutsy--again, no big deal. It was a bit strange, he admits, kissing a straight man he's known long enough to be chinking buddies with (they had already worked together on the Soviet-submarine thriller K-19: The Widowmaker), but really, "You just look for qualities that are attractive in [your on-screen partner], and Liam has a lot of attractive qualities. Kissing is kissing."
It's not that Martin's a predator, just blissfully open-minded about sex and insatiably curious to explore it. "I wanted to treat him like he was embryonic, in a way," says Sarsgaard, "like [he] had somehow …