Worry about what partners want in bed has accelerated marriage break-ups and led to a growing number of extra-marital affairs, counsellors said yesterday. Of 5,510 calls to the Caritas Family Service hotline this year, more than 60 per cent said they needed counselling after discovering their spouses were having an affair. Another 37 per cent wanted to know how to prevent extra-marital affairs by putting more life into their relationships. Nearly 20 per cent were calling to ask about marriage laws and how to apply for legal and financial assistance. About 40 per cent of partners discovered their spouses' infidelity up to two years after the affairs took place. Paulina Kwok Chi-yen of the Caritas Family Service attributed the phenomenon to a lack of mutual understanding and unsatisfactory sex lives. 'Chinese always feel shy to speak about their sexual demands,' Ms Kwok said. 'Women even think satisfying their husband's sexual desire is their duty, but that's not the case.' Ms Kwok encouraged couples to talk more and respect their marriage vows.