today's diagnostic standards, but there was little differentiation between normal and pathological behaviour at the time. Subsequent research showed that 65% of men had engaged in peeping, which suggests that this behaviour is widely spread throughout the population. Congruent with this, research found voyeurism to be the most common sexual law-breaking behaviour in both clinical and general populations. An earlier study, based on 60 college men from a rural area, indicates that 54% had voyeuristic fantasies, and that 42% had tried voyeurism, concluding that young men are more easily aroused by the idea. In a national study of Sweden it was found that 7.7% of the population (16% of men and 4% of women) had engaged in voyeurism at some point. It is also believed that voyeurism occurs up to 150 times more frequently than police reports indicate. This same study also indicates that there are high levels of co-occurrence between voyeurism and exhibitionism, finding that 63% of voyeurs also report exhibitionist behaviour. Characteristics People engage in voyeuristic behaviours for diverse reasons, but statistics can indicate which groups are likelier to engage in the act. Early research indicated that voyeurs were more mentally healthy than other groups with paraphilias. Compared to the other groups studied, it was found that voyeurs were unlikely to be alcoholics or drug users. More recent research shows that, compared to the general population, voyeurs were moderately more likely to have psychological problems, use alcohol and drugs, and have higher sexual interest generally. This study also shows that voyeurs have a greater number of sexual partners per year, and are more likely to have had a same-sex partner than most of the populations. Both older and newer research found that voyeurs typically have a later age of first sexual intercourse. However, other research found no difference in sexual history between voyeurs and non-voyeurs. Voyeurs who are not also exhibitionists tend to be from a higher socioeconomic status than those who do show exhibitionist behaviour. Gender differences Research shows that, like almost all paraphilias, voyeurism is more common in men than in women. However, research has found that men and women both report roughly the same likelihood that they would hypothetically engage in voyeurism. There appears to be a greater gender difference when actually presented with the opportunity to perform voyeurism. There is very little research done on voyeurism in women, so very little is known on