Uma Thurman has RSVPed a definite "yes" to Lars Von Trier's penis party, having joined the orgy of famous people enjoying unsimulated sex for art's sake in his upcoming Nymphomaniac. Of course, it's unclear as yet the extent of Thurman's role in this chronological exploration of a woman's erotic life, a scenic route that includes stops at the (possibly body-double-and-visual-effects-enhanced) valleys of Charlotte Gainsbourg, the foreboding peaks of Shia LaBeouf, the gently rolling hills of Stellan Skarsgard, and the wind-eroded crags of Christian Slater. But considering Uma Thurman is like 8 feet tall, she could probably just stand back and watch.