The man's personality, on the other hand, doesn't seem to have much of an effect on how often the couple has sex. But the increase in time spent working and parenting may be possible explanations for the drop in sex among married people. That drop in frequency was even steeper for married couples who live together; they had sex 16 fewer times a year. In this case, both partners' personalities mattered. From to , the average American adult had sex nine fewer times per year than Americans did from to , the researchers found. Intriguingly, husbands' openness was negatively correlated with satisfaction, while for wives it was the opposite. With others, we are hoping to arouse your libido and interest you in a whole new batch of unfamiliar characters. So if you can't keep up with the most titillating, provocative, and downright spicy sex scenes on Netflix, we have neatly compiled them all for you here. Also, since so much of sexuality is informed by culture and upbringing, it would be fascinating to see how people in more "liberated" areas like New York or San Francisco compare with those in more conservative enclaves. Plus, it would also be useful to get more queer relationships in the mix, and Meltzer told Science of Us that future research would benefit from examining them. The husband's personality, on the other hand, was not a predictor of sexual frequency. In heterosexual marriages , the happier people are with their sexual lives, the happier they are with their relationships. McNulty asked participants to keep daily diaries -- a more reliable way of measuring sexual frequency than asking people to retrospectively remember -- and take a personality test of their so-called Big Five personality traits, the most agreed-upon personality model. For proof, you need look no further than Netflix's selection of original series and the absolute best shows from around the world. Previous studies have found that men want and initiate sex more than women, the authors say, prompting women to be labeled as "the 'gatekeepers' of sex within relationships.