In their 2015 book, Modern Romance, the sociologist Eric Klinenberg and the comedian Aziz Ansari (who earlier this year became infamous for a hookup gone awry) describe Ansari’s visit to Japan seeking insights into the future of sex. He concluded that much of what he’d read about herbivore men missed the mark. Herbivores, he found, were “interested in sexual pleasure”—just not “through traditional routes.” Among Japan’s more popular recent innovations, he notes, is “a single-use silicone egg that men fill with lubricant and masturbate inside.” One night in Tokyo, Ansari picks one up at a convenience store, heads back to his hotel, and—sorry for the visual—gives it a go. He finds it cold and awkward, but understands its purpose. “It was a way,” he writes, “to avoid putting yourself out there and having an actual experience with another person.”
Sexual activity (but not masturbation) has been linked with lower systolic blood pressure. Elevated blood pressure, in turn, is associated with an increased risk of heart disease, stroke, and more. It's thought that sexual activity helps dilate blood vessels, increasing the delivery of oxygen and nutrients to the cells of the body while reducing blood pressure.
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Males and females are anatomically similar; this extends to some degree to the development of the reproductive system. As adults, they have different reproductive mechanisms that enable them to perform sexual acts and to reproduce. Men and women react to sexual stimuli in a similar fashion with minor differences. Women have a monthly reproductive cycle, whereas the male sperm production cycle is more continuous.[page needed]
Sexual behavior changes over time as a reflection of age, experience, and one's relationship. And the trajectory of change may vary between men and women. Women may encounter difficulties in navigating cultural attitudes about sexual behavior and promiscuity as they first explore their sexuality; age brings confidence and skill at communication that can enhance sex life. Young men often have concerns about performance, penis size, or premature ejaculation—and anxiety is no friend to performance for either men or women. Men often experience challenges with arousal and erectile dysfunction as they age. Couples tend to report that their sex life is most robust when they are in their 30s and 40s, but sex life is often most deeply rewarding for older partners. People can enjoy satisfying sex throughout the lifespan if they make adjustments for the many changes that time brings; that can mean relying less on penile penetration and more on massage, whole-body touching, and oral sex.