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Sexuality

Sexuality deals with humans' perceptions and behaviors as sexual beings. Learn about both the biological and emotional aspects of sexuality in this section.

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Sexual Intercourse

What is the definition of sexual intercourse? Learn about the physical and psychological effects of sexual intercourse and lovemaking.


References for Having Sex: What's really happening?

What happens during sex? We'll explain all the crazy things that happen to your brain and your body when you're getting it on. See more »

Does cheating run in the family?

Plenty of people cheat. Collective data on cheating behavior among married couples projects that between 20 and 40 percent of men and 20 and 35 percent of women have committed adultery against their respective spouses. Could genetics be to blame? See more »

Timeline of Sex Pictures

The how-tos of sex haven't changed much over the ages, but our understanding of what's actually happening (and why) took off during the Renaissance. How have humanity's thoughts and beliefs about sex evolved throughout history? See more »

Love in the Lab: Top 5 Historical Discoveries About Sex

As science advanced from philosophy to empirical knowledge, groundbreaking discoveries -- like the five on this list -- revealed a lot about the reproductive equipment inside human bodies. Which revolutionized our understanding of sex the most? See more »

How Orgasms Work

After decades of clinical research, there's still a lot that's not known about that climactic, pleasurable sexual sensation known as an orgasm. What's the biology behind the big moment? And why do men and women experience it differently? See more »

Do men have a stronger sex drive?

Contrary to popular belief, men don't think about sex every 7 seconds. But do they think about it more than women do? What do evolutionary biologists have to say about why one sex has a stronger sex drive than the other? See more »

Does love make your pupils dilate?

The eyes are more than the "windows to the soul"; they may help broadcast our sexual arousal patterns as well. What do changes in pupil dilation have to do with it? See more »

What's the future of virtual sex?

The future is bright for virtual sexuality. After all, we're human beings. Think of any great artistic or technological achievement and chances are it winds up in the bedroom. Will it end up in yours? See more »

What's the chemistry behind long-term marriage?

Contemporary researchers peeking into the interpersonal and neurological pathways of long-term love have uncovered a host of ingredients for making marriages work. But how many of them are within our control? See more »

How Asexuality Works

You can't neatly slice the human population into heterosexual and homosexual camps. For people who identify as asexual, sex is a moot point. But does that mean romantic relationships are completely out of the question? See more »