Eight in 10 men who called a sex helpline in Thessaloniki did so because they were anxious about their performance in bed, according to figures made public yesterday. The Center for Sexual and Reproductive Health at Aristotle University in Thessaloniki received some 3,000 calls between September 2004 and April 2007, when the data was gathered. The statistics show that the average age of the callers was 47 and that younger men were far more likely to be calling for advice about their performance problems. Those experiencing fewest concerns were men who were either married or in long-term relationships. Only 15 percent of married men who called the helpline were anxious about whether they were satisfying their wives. Half of all those that called said that their sexual prowess was being affected by stress at work.