- Sanjib Sharma 10-12-2016
Most of the animals have periods when they come into heat, and outside these periods they don't find sex interesting at all. However, the case is different for human beings who are constantly interested in sex.
So, what is the reason behind it? A study says that the reason why human beings function differently is because sex serves as a "glue" in a committed relationship.
The findings, published in the scientific journal Evolution and Human Behavior, said sex is important for pair-bonding between men and women in relationships and not just mere waste of energy.
According to the study, done at the Norwegian University of Science and Technology (NTNU) and the University of New Mexico, a correlation was found between the type of oral contraceptive women use and how often couples have sex.
"The function of sex in humans outside ovulation is an evolutionary mystery. But we believe that it has to do with binding the parties in the relationship together," says Leif Edward Ottesen Kennair, a professor of psychology at NTNU.
Kennair worked with Trond Viggo Grøntvedt, Nick Grebe and University of New Mexico Professor Steve Gangestad to know the opinion of hundreds of Norwegian heterosexual women about contraception, sex and relationships.
Their results show that of women in long-term relationships and who are using hormonal contraception, those who are more committed to their relationships have more sex with partners, as one might expect.
“But this association was especially true when the contraceptive (birth control pills, implantable rods and patches) that women used had potent levels of synthetic hormones that mimic the effects of the natural hormone progesterone, and lower levels of the hormone estrogen," Gangestad said.
"We're talking about intercourse here, not other types of sex like oral sex, masturbation and such. This strengthens the idea that sex outside the ovulation phase has a function besides just pleasure," says Grøntvedt.
The study concluded: The women who used contraception with more estrogen were most sexually active when they were in a less committed relationship. On the other hand, women who used contraception with more progesterone were the most sexually active when they were faithful and loyal to their partners.