Most millennials find sex between two people of the same gender to be more morally acceptable than casual sex (42 percent versus 37 percent), according to a survey published by the US-based Public Religion Research Institute.
The survey underscores the millennials' view on sexuality, religion, politics and morality.
The study largely found that millennials determine the morality of a situation based on context, and often avoid taking hardline stances on issues that polarise older generations, such as abortion and homosexuality.
The study polled 2,300 Americans between the ages of 18 and 35, finding nearly 40 percent of young people polled believe homosexuality is always morally wrong.
Around 38 percent were concerned about the morality of sex between people in non-committed relationships.
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And while a higher number of millennials think sex outside of marriage is morally acceptable, acceptance of extramarital relations has increased to a whopping 28 percent among Americans 55 years and older.
While 41 percent of respondents believe sex between teens under 18 is always morally wrong, almost as many agreed that pregnant teens and teen parents face a lot of stigma.
While millennials may be more personally intolerant than previously thought, they do recognise the importance of protection from discrimination in the workplace.
A majority acknowledged that women face significant workplace discrimination, and nearly three-quarters of respondents believe gay and transgender people should have legal protection against discrimination in jobs, public accommodation and housing.