One in ten Korean couples sleep in separate rooms, and one in five couples maintain a sexless relationship, according to a survey of 500 couples aged between 30 and 60.

Bayer Healthcare and the Happy Home Foundation conducted the survey in August, revealing that 12.7 percent of respondents slept in separate rooms to their spouse, with those in their late 50s accounting for 15.6 percent, the largest portion of sexless couples. And 11.5 percent of survey participants in their 30s said that they didn't have sex with each other, confirming a theory that more young couples become detached in the bedroom.

Respondents felt that having sex with their spouse more than once a week is preferable, though 21.1 percent were found to have sex less than once a month.

According to the survey, the number of time couples want to have sex was matched to the number they actually did until they reach their early 40s. The actual number drops considerably by their late 40s, which, analysis says, can prompt conflict and suspicion in their relationship.

Men and women have very different ideas about good sex. Almost half of the women in the survey cited a lack of a romantic attention or caresses from their partner as the reason for their sex dissatisfaction.

For men, generating a passionate atmosphere and their ability to perform for a long period of time was deemed the most important. Two out of three couples are still reluctant to talk about sex with their spouse. Korean couples were found to be passive in tackling sex problems.