Why we're secretly attracted to our parents' lookalikes.

These are some of questions about relationships sociologist Michael Rosenfeld, of Stanford University, has been asking as part of a longitudinal study.

Recruited for a wedding party? One woman shares her requests to remain sane.

COMMENT: For those who are growing up in the digital area, sexting is fun and flirty - and safe, writes Melissa Isabella Meyer.

Swiping right while in another country could lead to more than just a date - it's also a great way to meet locals.

Psychologists reveal why we close our eyes when locking lips.

Researchers' surprising findings about smart people and what makes them happy.

Princess Diana's former private secretary opens up about her 1995 tell-all interview.

If you're looking for love on social media dating sites your success may rest with the person one swipe before you.

COMMENT: You will have seen this topic covered before. Sometimes the discussion goes around in circles: What effect will it have on their brains? Are they in danger? Could it be a positive?

With their shared boyfriend.

And some advice for the girls on The Bachelor.

Different bachelor. Same old sexist messages being broadcast to young minds across the nation, writes Shelley Bridgeman.

With 'cyberdildonics' set to become the next big thing in sex toys, experts warn of the dangers.

COMMENT: How do you tell a child about their grandparent's sexuality?

COMMENT: Learning what it's really like to be a solo parent.

More prevalent and obtainable than ever before, Sarah Williams asks if we're really okay with this more casual approach to relationships.

Before tongues start wagging, Daniel Vettori is still very much married despite his profile appearing on a dating website.

COMMENT: We may be better at talking about depression, but there is still deep shame in being honest about other forms of mental illness, writes Deborah Hill Cone.

Fresh from breaking his silence about his pornography addiction, Olympian now wants to shift the public's focus to the sexual exploitation of women.

For many people the idea of disabled people needing or wanting sex seems to be something entirely new to think about, writes Joy Gunn.

She revealed relationships to the likes of Calvin Harris and Ricky Hilfiger helped with the songs.

We know our DNA helps form our own offspring's genetic makeup. Now scientists have thrown something else in the mix.

Olympian Nick Willis says he has no regrets over breaking his silence about his pornography addiction.

Many of us are familiar with the distress brought on by a break up. Relationship expert Jill Goldson weighs in on how to manage a broken heart.

As a 16-year-old in Kentucky you can't vote or buy alcohol, but you can get married with a parent's signature, just like a permission slip for a field trip.

Launched last year to huge fanfare, a new study reveals its effects.

Scientists explain why women are attracted to men with feminine features.