SATISFYING sex is not the biggest concern for married couples, according to a new survey. And looks don't matter a jot, says the study by Hong Kong Polytechnic University on what makes a good marriage. Sexual enjoyment ranks only eighth out of 14 priorities, although 60 per cent say it is important. Only 18 per cent believe a couple should divorce if they do not have a satisfactory sex life. The study, which interviewed 376 families on their views of marriage, shows that a lover's looks matter least, with just 27 per cent saying appearance is crucial. Survey researcher Professor Lee Ming-kwan, associate head of the university's Department of Applied Social Studies, says Hong Kong people are still conservative about sex. Some respondents may have been too shy to say sex was important to them. Mutual tolerance and understanding, respect and friendship, as well as fidelity, rank as leading factors for a good marriage, with the support of 93 per cent of families. They also consider sharing household chores highly important, with 80 per cent in support. Factors such as earning a good income, shared interests and a good living environment drew about 70 per cent of support. 'It shows Hong Kong people consider loyalty and respect the most important things in marriage,' Professor Lee said. The results also show pessimism about the state of the hallowed institution. Eighty-two per cent say people today are not serious about marriage. More than half - 53 per cent - say divorce should be made more difficult. About 66 per cent say they would advise a young person to go straight into marriage, while 23 per cent think couples should live together before going to church. The study was part of a territory-wide survey of social indicators by various local universities, which should be published this year.