Once again, blame the teachers. It is a little tiring to read Ms Weyman's comments that poor sex education in schools is to blame for this. Every child get the biological facts of life at secondary school at least twice, in Y7 and Y11. They also get PSHE sessions that deal with social and health aspects of sex.

Unfortunately, there is an attitude in Britain that believes that if there is some problem, such as anti-social behaviour, sexual ignorance or whatever, it can be blamed on teachers and it is their problem to deal with.

Schools shoulder some, not all, of these responsibilities. Health centres, and other agencies should also be taking a lead in promoting greater sexual intelligence.

Charles, Ipswich, UK

"Almost one third of adults believe that jumping up and down after sex stops a woman getting pregnant"

Rubbish. I've never heard of anyone believing that, ever...seriously, what population was polled such that "one third" could believe something so rediculous? This survey, the premise of this article, seems spurious to me.

Joe, Melbourne, Australia

Rubbish!! Anyone'd think that the British have no sense of humour at all!! Faced in the street with an earnest questioner asking if my wife could get pregnant if she jumped up and down after sex, am I going to give a sensible answer??

Of course not!!

PS You can't can you??

Pu Li, Guangxi, China