When viewing attractive female models, unrestricted men are more interested in the models ’ physical attractiveness, while restricted men show more interest in the social traits presumably possessed by attractive females. Unrestricted women report more interest in attractive male models ’ popularity and are less interested in their willingness to commit, compared to restricted women. Mate preferences Men and women with an unrestricted sociosexual orientation view short-term mates with greater sexual experience as more desirable, whereas restricted women perceive partners ’ sexual inexperience as desirable. Unrestricted individuals place more importance on partners ’ physical attractiveness and sex appeal, while restricted individuals place more weight on characteristics indicative of good personal and parenting qualities (e.g., kind, responsible, faithful). Judgement of sexual attractiveness is more variable in unrestricted men than in restricted males. Hormones Individuals who are partnered typically have lower testosterone levels than individuals who are single. However, this was found to apply solely to individuals who have a restricted sociosexuality. Partnered, unrestricted men and women ’ s testosterone levels are more similar to the levels of single men and women. Implications Possessing an unrestricted sociosexuality seems to increase the likelihood of having a son by 12-19\% in American samples. This may be explained by the generalized Trivers-Willard hypothesis, which states that parents who possess any heritable trait that increases males ’ reproductive success above females ’ will have more sons, and will have more daughters if they possess traits that increase females ’ reproductive success above males ’ . Since unrestricted sociosexuality increases the reproductive fitness of sons more than daughters (as males have the potential to have more offspring through casual sex), unrestricted parents have a higher-than-expected offspring sex ratio (more sons). Sex ratio theory Operational sex ratio is the number of sexually competing males versus the number of sexually competing females in the local mating pool. High sex ratios indicate that there are more men than women available, while low sex ratios imply more women than men are sexually available. High sex ratios (more men) are associated with lower SOI scores (more restricted sociosexual orientation), as men must satisfy women ’ s preference for long-term monogamous relationships if they are to effectively compete for the limited number of women. Low sex ratios (more women) are correlated with more unrestricted sociosexuality, as men can afford to demand more casual sex if they are relatively scarce and in demand. External links Gender Differences in Attitudes about Casual Sex The revised Sociosexual Orientation Inventory
When viewing attractive female models, unrestricted men are more interested in the models ' physical attractiveness, while restricted men show more interest in the social traits presumably possessed by attractive females. Unrestricted women report more interest in attractive male models ' popularity and are less interested in their willingness to commit, compared to restricted women. Mate preferences Men and women with an unrestricted sociosexual orientation view short-term mates with greater sexual experience as more desirable, whereas restricted women perceive partners ' sexual inexperience as desirable. Unrestricted individuals place more importance on partners ' physical attractiveness and sex appeal, while restricted individuals place more weight on characteristics indicative of good personal and parenting qualities (e.g., kind, responsible, faithful). Judgement of sexual attractiveness is more variable in unrestricted men than in restricted males. Hormones Individuals who are partnered typically have lower testosterone levels than individuals who are single. However, this was found to apply solely to individuals who have a restricted sociosexuality. Partnered, unrestricted men and women ' s testosterone levels are more similar to the levels of single men and women. Implications Possessing an unrestricted sociosexuality seems to increase the likelihood of having a son by 12-19\% in American samples. This may be explained by the generalized Trivers-Willard hypothesis, which states that parents who possess any heritable trait that increases males ' reproductive success above females ' will have more sons, and will have more daughters if they possess traits that increase females ' reproductive success above males ' . Since unrestricted sociosexuality increases the reproductive fitness of sons more than daughters (as males have the potential to have more offspring through casual sex), unrestricted parents have a higher-than-expected offspring sex ratio (more sons). Sex ratio theory Operational sex ratio is the number of sexually competing males versus the number of sexually competing females in the local mating pool. High sex ratios indicate that there are more men than women available, while low sex ratios imply more women than men are sexually available. High sex ratios (more men) are associated with lower SOI scores (more restricted sociosexual orientation), as men must satisfy women ' s preference for long-term monogamous relationships if they are to effectively compete for the limited number of women. Low sex ratios (more women) are correlated with more unrestricted sociosexuality, as men can afford to demand more casual sex if they are relatively scarce and in demand. External links The revised Sociosexual Orientation Inventory
R
’
'
R
’
'
R
’
'
R
’
'
R
’
'
R
’
'
R
’
'
R
’
'
R
’
'
R
’
'
D
Gender Differences in Attitudes about Casual Sex