Tonight's TV highlights

The Royal Academy Summer Exhibition 2011 7pm, BBC2 The Royal Academy's Summer Exhibition is the biggest open-submission art show in the world. This means that, for a £25 entry fee, you could conceivably find your novice watercolours hanging alongside works by the cream of contemporary art (including, this year, Cornelia Parker, Michael Landy, Richard Long and Martin Creed). Alastair Sooke goes behind the scenes of this peculiar annual art-world ritual, and also talks to Honorary Royal Academician Jeff Koons, whose giant Coloring Book sculpture currently adorns the Royal Academy's courtyard. Sam Richards The Shadow Line 9pm, BBC2 So . . . that's all clear then? Time for the final hour of espionage, drug-deals and cat-bothering tonight as players on either side of the line enter into an endgame of sorts. The most enjoyable/baffling seven hours on TV this year (if you've stuck with it) – great to see a British drama that's so wilfully loopy. Richard Vine The Sex Researchers 10pm, Channel 4 Channel 4 is a seasoned veteran at disguising lascivious content as sex ed, but this new three-part series manages to keep the titillation/information ratio weighted narrowly in favour of the latter. The Sex Researchers opens with an episode on the female orgasm, which has confounded scientific consensus for generations. Victorian medical professionals were convinced that women were incapable of orgasm, leading to the populist belief that only men should enjoy sex. However, a few bold, contrarian figures conducting some rather risque studies, were able to prove otherwise, leading to a more enlightened understanding of female sexuality. Gwilym Mumford One Born Every Minute USA 9pm, More4 The original One Born Every Minute brought childbirth to primetime and with it a funny, moving portrait of life on the maternity ward. It quietly became a hit, mostly thanks to word of mouth, and recently finished its second series. And now it's gone global. The American version takes place at the Riverside Methodist Hospital in Ohio, and to kick things off there's an imminent caesarean, and a 40-year-old woman who contemplates having a second child. Rebecca Nicholson Unnatural Histories 9pm, BBC4 Continuing this series which queries whether or not our notion of national "wilderness" is a wishful figment our imagination, this week it's the turn of Yellowstone. The world's first national park, it is fondly regarded as a prime example of the preservation of the untouched wild, beautiful and uninhabited. However, this turns out to be a myth. It was not conservationists but railroad barons who forged the Yellowstone "vision", which was heavily influenced by European romantic ideas of how nature ought to be cast. Moreover, in order to make way for this idyll, the Native American tribes who once occupied Yellowstone had to be turfed out of their homes. David Stubbs Ideal 10.30pm, BBC3 Moz's pursuit of Tilly continues tonight as he goes along with her misapprehension that he's a conceptual artist. She arranges an exhibition for him with genuinely hilarious consequences. Meanwhile, Nikki's sister Jess decides to experiment with ketamine. Great idea when your boyfriend's got a plastic cartoon mask for a face. If you've never seen it, Ideal is like the fire alarm's gone off at Bedlam but with tightly scripted gags and satisfying narrative arcs. And if you still haven't seen it, do something about that now. You won't regret it. Julia Raeside