Monarchy By David Starkey (C4); A Girl's Guide To 21st Century Sex (five); True Voice Of Prostitution (C4): The Prince of Wales was in a bad way.

At 48, he was under the influence of drink and drugs, had a gargantuan appetite and "debts beyond all kind of calculation".

That wasn't all. "His skin had turned a deep coppery hue," said David Starkey at his most serious in the latest instalment of Monarchy.

None of which stopped him getting married as his father, George III, was eager for an heir. The bride, his cousin Caroline of Brunswick, was not a hit - it was loathing at first sight.

If the Prince of Wales wasn't much of a catch, she was "coarse, uneducated and none too clean", according to Starkey, wearing an expression you might adopt if you'd just sniffed a cow pat.

The bridegroom spent his wedding night with his head in the hearth after drinking too much brandy. He recovered sufficiently the next day to make Caroline pregnant. Mission, as they say, accomplished although the marriage was short-lived.

It might have fared better if Caroline had been able to watch A Girl's Guide To 21st Century Sex - or the 18th century equivalent - in which various experts were on hand to help improve people's sex life.

The most amazing thing was not tips to pep up your love-making but where they put the cameras to give you an inside view, quite literally, of what happens during sex.

This is also a series where the phrase "coming up after the break" takes on a whole new meaning. We learnt about aphrodisiacs (surely they were joking about lard being a turn-on) and how to change the taste of your semen (apparently vegetarians are tastiest).

Student Daniel telling us all about genital crabs was enough to put your eating anything or anyone, while sexual positions demonstrated included one called "splitting the cicada", which sounds like something the World Wildlife Fund should outlaw.

By the time 70-year-old George was shown having sex with his custom-built doll on camera during an item on pensioner passion, I, unlike George, had had enough.

I left without learning about the attraction of having sex in public places and moved on to paying for sex. True Voice Of Prostitution was part of a series of monologues - rape and murder feature in others - using "the real words of real people". Only the names and places have been changed to protect the innocent.

Lesley Sharp opened the proceedings quite brilliantly as she recalled The Business that has high class hookers at the top and crack whores at the bottom.

I liked the line about why she'd joined the Tory Party. "That keeps me active," she said, although I'm unclear whether it was the politics or pleasure of the Honourable Members that satisfied her most.