London, June 18 One in three men are too afraid to have sex because of their "demanding" partners, an expert has claimed.

Professor Zbigniew Izdebski, who ran a study in Poland, blamed magazines meant for women and websites for telling them how much foreplay to expect.

They also teach ladies how men should help them achieve orgasm, reports The Sun.

Because of all this, many men see sex as a test.

Izdebski said: "Instead of enjoying sex, men instead try to remember the 'right' routine.

"Consequently, we see more and more 'having headaches'." (ANI)