This Week in Sex is a weekly summary of news and research related to sexual behavior, sexuality education, contraception, STIs, and more.

Men Less Likely to Have Safer Sex If Partner Is ‘Hot’

The old adage “Never judge a book by its cover” is apparently easily forgotten when it comes to judging potential sex partners. A new study in BMJ Open found that men said they were less likely to use a condom if their potential partner was hot.

In this small study, researchers showed pictures of 20 women to 51 heterosexual men. The men were asked to rank how attractive the woman was, how likely they would be to have sex with her if given the opportunity, and how likely it was they would use a condom if they did have sex with her. The results revealed that the more attractive a man found a woman, the less likely he was to intend to use a condom during sex with her.

Men also rated how attractive they consider themselves, and the results showed that this was also related to condom use. Men who thought of themselves as more attractive were less likely to intend to use a condom.

Researchers also asked the men to estimate how many out of 100 men like themselves would have sex with each woman given the opportunity and finally, how likely they thought it was that the woman in the picture had a sexually transmitted infection (STI).

The results of these two questions turned out to be related: The men assumed that women whom other men would want to sleep with were more likely to have STIs.

This did not make the men in the study any more likely to intend to use a condom with those women. In fact, the men were most likely to intend condom use with women they found less attractive, even though they considered these women less likely to have an STI.

This was a small study with a relatively homogenous group of men ages 18 to 69 near Southhampton, England, and it measured intention rather than behavior.

Still, the results could present a challenge for public health experts if men are making condom decisions on a broader scale based on attraction rather than risk assessment.

How and Why Women Groom Their Pubic Hair

A new study published in JAMA Dermatology is the first nationally representative survey of U.S. women’s pubic hair grooming habits. The study included more than 3,300 women ages 18 to 64.

Overall, 84 percent of women had engaged in some pubic hair grooming. Pubic hair grooming was more common among younger women (ages 18 to 24); among white women; and among women who had gone to college.

Before you start thinking everyone is out getting Brazilians, however, grooming means different things to different women. Only 21 percent of women said they took all their pubic hair off more than 11 times, and 38 percent of women say they’ve never done so. Moreover, waxing lags behind the most popular hair removal methods; only 5 percent of women say they wax compared with 61 percent who shave, 18 percent who use scissors, and 12 percent who use electric razors. (Respondents could choose more than one answer in the survey.)

Most women (93) do it themselves, 8 percent have their partners help, and 6.7 percent go to a professional.

The researchers were most interested in the most common reason women groom their pubic hair. The most common reason was hygiene (59 percent), followed by “part of my routine” (46 percent), “makes my vagina look nicer” (32 percent), “partner prefers” (21 percent), and “oral sex is easier” (19 percent).

Tami Rowen, the lead author of the study and a practicing gynecologist at the University of California, San Francisco, told the New York Times, “Many women think they are dirty or unclean if they aren’t groomed.”

But while people may think that, it’s not true. Pubic hair actually exists to help protect the delicate skin around the genitals. Rowen and other doctors who spoke to the Times believe that women, especially teenagers, are taking up grooming practices in response to external pressures and societal norms as reflected in images of hairless genitals in pornography and other media. They want young people to know the potential risks of grooming and say they’ve seen an increase in grooming-related health issues such as folliculitis, abscesses, cuts, burns, and allergic reactions. As some may remember, This Week in Sex reported a few years ago that emergency-room visits related to pubic hair grooming were way up among both women and men.

This Week in Sex believes that women should be happy with their genitals. Keeping the hair that grows does not make you dirty—in fact, it is there for a reason. But if shaving or waxing makes you happy, that’s fine. Do be careful, however, because the doctors are right: Vulvas are very sensitive and many methods of hair removal are very harsh.

Wedding-Night Sex May Be Delayed, But That’s OK With Most Couples

Summer is a popular wedding season, with couples walking down the aisle, exchanging vows, and then dancing the night away with friends and families. But how many of them actually have sex after the caterer packs up and the guests head home?

According to lingerie company Bluebella—about half. The company surveyed 1,000 couples about their postnuptial sex lives and found that 48 percent of them said they did “it” on their wedding night. Most women in those couples who did not get it on that night said they were just too tired. The men, on the other hand, said they were too drunk or wanted to keep partying with their friends. (It is unclear whether the survey included same-sex couples.)

By the next morning, another 33 percent of couples had consummated their marriage, but about 10 percent said it took 48 hours to get around to it.

But whenever couples did have that post-wedding sex, the overwhelming majority (84 percent) said it lived up to their expectations.