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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.

Because the life span of all individual forms of life, from microbes to man, is limited, the first concern of any particular population is to produce successors. This is reproduction, pure and simple. Among lower animals and plants it may be accomplished without involving eggs and sperm. Ferns, for example, shed millions of microscopic, nonsexual spores, which are capable of growing into new plants if they settle in a suitable environment. Many higher plants also reproduce by nonsexual means. Bulbs bud off new bulbs from the side. Certain jellyfish, sea anemones, marine worms, and other lowly creatures bud off parts of the body during one season or another, each thereby giving rise to populations of new, though identical, individuals.

If you have endometriosis, you know that its effects extend beyond your monthly period. Here's how you can minimize pain and discomfort during sex.

Have your partner lie on their back in bed and draw their knees in toward his chest. Grab their legs and use them as leverage to help you move up and down, controlling the pace and depth of penetration.

Use this to your advantage to help you get what you're looking for. Traditional sexy is great when you're trying to attract more temporary partners. This is because a lot of traditional sexy is about putting on a show, which hides or downplays your natural personality and looks (sending the message that you don't care if someone likes you for who you are).

Sex isn’t the only indicator of health or happiness. You can still lead an active and happy life without sex.

When a popular couple is on the rocks, Otis eyes an opportunity. Eric finds community. Surprises in the bedroom leave Jackson questioning his sexuality.

When it comes to women getting off, sex experts say the key (at least physically) is to stimulate the clitoris, which is the anatomical equivalent of the penis in terms of structure and sensitivity. But because much of the clitoris is buried in tissue, muscle and fat, it can be more complicated and time-consuming to stimulate and bring to orgasm.

Sex can help you connect to your partner, thanks to oxytocin. Oxytocin can play a role in developing relationships. website You may find that consistent, mutual sexual pleasure helps with bonding within a relationship.

Egged on by Maeve -- and finding that dispensing sex tips is tougher than he thought -- Otis tries offering free advice at a classmate's house party.

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

For example, if you're looking for a sporty person, wear your hair in a ponytail or sport the occasional hiking outfit or football jersey.

sex, the sum of features by which members of species can be divided into two groups—male and female—that complement each other reproductively.