Here are 20 fascinating facts about love and sex that may surprise you. Advertisement 2 of 21 Getty Images Spouses may have similar DNA Scientists already knew that people tend to choose romantic partners with similar characteristics, such as age, race, religion, income, and upbringings.
But a study published in the Proceedings of the National Academy of Science found that people also tend to marry others with similar DNA. When researchers studied the genetic material of white American couples, they found fewer differences in the DNA between married people than between two randomly selected individuals within the same race.
In fact, they calculated that the tendency to pair up with a genetically similar spouse is about one-third as strong as the tendency to do so with someone with a similar education. In his study, couples attended counseling or watched relationship-themed movies and completed discussion guides together. Advertisement 4 of 21 Getty Images Some people may be wired to want more sex Your brain wiring may influence your number of sexual partners , according to a University of California Los Angeles study.
Researchers performed brain scans of volunteers while they viewed images, some sexually suggestive, and also asked their sexual behaviors within the past year. Turns out those whose brains were most active when viewing the sexual images also tended to have had the most partners.
Advertisement 5 of 21 Getty Images Lower cholesterol can boost performance in the bedroom Along with damaging arteries and working the heart overtime, high cholesterol can also contribute to erectile dysfunction in men. In fact, ED may serve as a warning sign for cardiovascular disease.
Men who take statins or other medications to lower their cholesterol are also likely to see an improvement in their sexual function, according to a study by researchers at Rutgers University's Robert Wood Johnson Medical School. Of course, stains should not be prescribed to treat ED on its own, say the researchers, since the condition can also be caused by other physical or emotional issues.
Advertisement 6 of 21 Getty Images Low blood sugar can create marital discord Arguments and aggression between husbands and wives can sometimes be the result of low blood glucose levels , say Ohio State University researchers. In a study, they asked married couples to test their blood sugar each night and morning, and to stick pins into "voodoo dolls" that represented their spouses, based on how angry they were with them.
The lower their blood sugar over the course of 21 days, the more pins they used. Low blood sugar can cause people to feel hungry—and therefore cranky and irritable. More than two-thirds of healthy Americans adults are infected with one or more strains of human papillomavirus HPV , a type of virus that is transmitted through sexual intercourse and oral sex. The not-so-scary news, however, is that only four of those people tested were infected with the types of HPV that are known to cause cervical cancer, throat cancer, or genital warts.
And even though the most high-risk strands, known as genotypes 16 and 18, can cause cancer, the good news is they usually don't. Most of the time, the body eliminates HPV without special treatment.