Evolution and Human Sexuality

Evolution is defined as the change in frequency of certain traits across generations. The accumulation of new traits may lead to new characteristics or even new species over time. This means that, with time, enough changes can lead to the formation of a new species. Evolution is a continuous, extremely gradual process that has created…

The Biology of Reproduction

Every organism must reproduce (create offspring) in order to pass a part of themselves on into future generations. Depending on the organism, it can either reproduce using sexual or asexual reproduction, which both involve cell division. The parental traits of sexually reproducing organisms will also mix to form a unique combination in the offspring, and…

Evolutionary Reasons for Incest Taboos

Why do Incest Taboos Exist? Incest is defined as sexual relations occurring between people so closely related that they are forbidden by law to marry each other.1 Throughout history, human societies┬áhave demonstrated an aversion towards incest. Even those living in societies without explicit legal systems exhibit a negative reaction to the idea of incest. The…

The Neurobiology of Romantic Love

Romantic love is one of the most universal human experiences. More than 20 years ago, biological anthropologist Helen Fisher studied 166 societies and found evidence of romantic love in 147 of them.1 According to Richard Schwartz, associate professor of psychiatry at MacLean Hospital, romantic love must be wired into our basic biological nature due to…

Sex and Methamphetamine

Methamphetamine, also known as meth, crystal, chalk, and ice, is a substance that is often sold illegally.1 It can be ingested in the form of a pill, smoked in a pipe, or injected with a needle.1 This white and odorless powder is a drug, or a chemical that is not naturally produced in the body,…