 Thus, risk to the agent might not be sufficient; perhaps the agent must also lack the sexual desire for the action or find it undesirable. The degree of supererogation increases in direct proportion to that of undesirability. As awful as it sounds, this fits with the type of cases that would come to mind in thinking of supererogation: sex with the least physically desirable. But there is room for subjectivity: a young gay man not attracted to other young men would find sex with them undesirable, so having sex with one out of kindness would be supererogatory in his case.