Viagra

Rob Schneider, Udderbelly, South Bank, London

This year, visiting American comedians have included Jim Gaffigan, who had a short but excellent stint at The Shaw Theatre, while the equally superb Marc Maron will play the Soho Theatre later this month. With the good must, inevitably, come the not-so-good – represented here by Rob Schneider, stand-up and star of knockabout movies such as Deuce Bigalow: Male Gigolo, Grown Ups and The Hot Chick and a former Saturday Night Live regular.

The trouble with sex

One major cause of misunderstanding between men and women is the awkward fact that sexual intercourse, which we imagine will bring us closer together, is poorly designed to give pleasure to both parties. Jeremy Laurance goes back to physiological basics

Like Viagra for your brain

Professionals use them for jet lag, students to pass exams, soldiers to stay alert. Brain-enhancing drugs are the latest fix – and they're legal

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