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Often, people assume that calling a guy "masculine" is a compliment, while calling him "feminine" is an insult. But a new poll by the research firm YouGov suggests this might finally be starting to change.

The poll asked 1,000 men and women in the U.S. and the U.K. to rate themselves on a scale from zero (completely masculine) to six (completely feminine). Here's what they found: Only 42 percent of guys considered themselves completely masculine. They also had roughly equal views of masculinity and femininity, with 77 percent viewing masculinity positively and 74 percent viewing femininity positively. The results were similar for women: Only 46 percent said they were completely feminine, and 13 percent of men and 25 percent of women said they'd worn clothing designed for the opposite gender.

These liberal attitudes seem to be growing as time goes on, since there were some pretty big age differences. Among men ages 18 to 29, for example, only 30 percent considered themselves completely masculine, while 65 percent of men over 65 did.

A review of research from earlier this year suggests that looser expectations for gender and sexuality could be changing what we look for in a partner. Nowadays, men are more likely than before to look for women with traditionally "masculine" traits like career success and a good education, while women are interested in men who can perform "feminine" roles like housework.

Maybe we partly owe this to the fact that men and women don't feel as much pressure to perform these gender roles themselves.