At an older age, sexual activity may affect your well-being and ability to think. Research found that sexually active adults between 50 to 90 years old had better memory. They were also less likely to feel depressed and lonely.

Sexual reproduction not only takes care of the need for replacement of individuals within a population but gives rise to populations better suited to survive under changing circumstances. In effect it is a kind of double assurance that the race or species will persist for an indefinite time. The great difference between the two types of reproduction is that individual organisms resulting from nonsexual reproduction have but a single parent and are essentially alike, whereas those resulting from sexual reproduction have two parents and are never exact replicas of either.

The research also suggests that the rhythm of sex can help women and men choose appropriate sexual partners.

Some of Annalise’s sex scenes are so wild and athletic that Davis “threw out her back” filming them. When her students aren’t busy with their coursework and investigating murders on the side, they take part in plenty of X-rated extracurriculars too.

Exactly what that night would entail remains a seductive mystery—one full of lust, blurred lines, and lots of money.

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Do It: Like classic cowgirl position, you’re on top as your partner lies back, and you push off their body for leverage. The twist here is that your partner assists. By holding your hips or thighs, he supports your weight and rises to meet your movements.

the intensity of blood pressure, heart rate, and breathing at their highest and both partners taking oxygen rapidly into the body

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But as time goes by, the real world creeps in, and their relationship begins to fray. Still, the moments in which they share their vulnerabilities and their raw, honest feelings will have you reliving those exciting early days of a crush. For nonstop entertainment, queue up some of the best TV shows of all time.

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This time, psychologist Guy Winch explains how to talk about an unfulfilling sex life with your partner -- and get what you want.

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A person will tend toward a sexual partner whose rhythm brings them the most pleasure because a good rhythm is a measure of sexual fitness.