The world of internet pornography is a pervasive and wide reaching technology, growing at a breathtaking rate. It is a $13 billion-a-year industry in the US. Nine out of 10 boys in America are exposed to it before the age of 18, and men are 543% more likely to be users than women.

Why do people sext? Why do they send racy or naked photos or videos and sexually loaded texts? For a short-term hookup, sexting might seem like a direct way to get what you want

Making friends is tough for teenagers. Making friends with the opposite sex can be even tougher. Our research, published in the Journal of Personality, suggests empathy may be the key to developing friendships, and may be especially important for young men establishing supportive friendships with young women.

Many researchers have asked why people cheat on their partners. A new study asked how they stay together.

You are on holiday with your partner of several years. Your relationship is going pretty well, but you wonder if it could be better. It’s Valentine’s Day and you find a bottle on the beach. You rub it. A love genie appears. He (or she) will grant you three special Valentine wishes. Here are some of your choices:

Comprehensive, inclusive sexuality and relationships education (“sex ed”) teaches children and adolescents in age-appropriate ways that sexuality is a normal, healthy part of life.

June kicks off the U.S. wedding season. Whether you love nuptials or hate them, an astounding trend is occurring: fewer couples are tying the knot.

After having their first baby, new parents report being only somewhat satisfied with their sex lives. The stress levels of moms—but not dads—may be a reason why.

We know a lot about why people choose different brands of dishwashing detergent, because companies spend billions of dollars investigating who buys what. But when it comes to the processes behind perhaps our most significant life choice – choosing a romantic partner – science knows surprisingly little.

The scene described in Nancy Jo Sales’s huge Tinder report published in Vanity Fair magazine featured groups of twenty-something friends and colleagues in a Manhattan bar relaxing after work. But rather than socialising with each other they were engrossed in the more private world of their mobile phones, seeking something completely personal: a sexual partner (albeit not necessarily just for sex).

Matchmaking and dating services used to advertise in small rectangles on tube carriages, next to the vitamin drinks and food delivery services, and in smaller rectangles still on the classified pages of newspapers and magazines.

Everyone loves a good story, but can a good story lead to love? Storytelling is a fundamental form of communication, and research has demonstrated the power of narratives to change minds and influence behavior.

We’ve all felt it at some time in our lives. Poets write about it, singers sing about it – and a whole industry has grown up around finding it, expressing it and maintaining it. But what is love? Where does it reside? What triggers it? And what’s really going on in our minds and bodies when we fall “head over heels”?

“Nice guys finish last” is one of the most widely believed maxims of dating. Fleshed out, the idea goes something like this: heterosexual women might say they want nice characteristics in a partner, but in reality what they want is the challenge that comes with dating a “bad boy”.

In the United States, the teen pregnancy rate is higher than in any other western industrialized country, according to the U.S. Centers for Disease Control and Prevention (CDC). At the same time, a growing number of American teens and young adults have been diagnosed with sexually transmitted diseases (STDs).

Lots of women look forward to motherhood – getting to know a tiny baby, raising a growing child, developing a relationship with a maturing son or daughter. All over the world, people believe that parenting is the most rewarding part of life.

It is perhaps one of the most controversial debates in sexual function: is there or isn’t there a G-spot? And if there is, how do we find it?

"Masculine traits in humans are not the same as, say, in peacocks where the beautiful tail attracts a mate," says David Puts. "For example, beards make men more dominant looking, scarier, and seemingly more dangerous, but most women prefer clean-shaven men."

True or false: *Couples with great relationships don’t fight. * Most people expect too much from marriage. * All the good men/women are already taken. * Love can heal all wounds. * If my partner were more like me, we’d have a better relationship.

"A lot of times, just by avoiding negative traits, people will probably be fairly well off—maybe even more well off—than if they were trying to optimize the best potential partner," says Gregory Webster.

The difficult thing is how to measure it, because people will probably over-estimate. If you’re a non-scientist, you might have once asked yourself, propped against the bedhead after disappointingly quick intercourse, how long does sex “normally” last?

Becoming vulnerable with a woman teaches you all about trust. I often hear, “I’ll be more vulnerable with her when I trust her more.” This attitude doesn’t work. Your vulnerability opens the door to trust, and trust opens the door to love.