Unless they're caught red-handed, how else can you confirm they're doing the dirty on you? Here are 18 clues.

COMMENT: Can a single image represent an entire gender? Kim Knight on the mysterious world of stock photography.

Take this quiz to find out.

A Perth man has been branded a "creep" after he shut down a woman on a dating website because he doesn't "consider dating women who are over 30 and overweight."

Men reveal what it's like to have a girlfriend with a job in the sex industry.

A new study on the nature of creepiness reveals the most disconcerting behavioural traits and the world's most creepy occupations.

A body language expert explains what Wills and Kate's gestures reveal about the state of their relationship.

A young student who has never had sex is selling her virginity to raise enough money to be able to study abroad.

One Illinois couple celebrated a major milestone yesterday - 77 years of marriage.

COMMENT: The claims that millennials have less sex has left me perplexed, says Tess Nichol.

Sometimes bridesmaids have better places to be, apparently.

COMMENT: Despite myths about middle-aged divorced women no longer being sexual beings, I've never met one who didn't appreciate being seen as one.

It's a real thing: Attractiveness is boosted by appearing next to those less good-looking

The hidden side of the impact of menopause.

Unhappy endings and their associated artifacts are on display at this unique Los Angeles museum.

A royal biographer has revealed the real reason Cressida Bonas split with Prince Harry in 2014.

What's the worst lie you've told your spouse? Surely it can't be as bad as these confessions.

I truly do feel like someone is missing from my life. Even though I have a partner, I will always be searching, writes Rachel Kramer Bussel.

COMMENT: Why being one of the cool kids doesn't necessarily last the distance.

A 19-year-old Australian woman has been left outraged after her doctor denied her a repeat of her contraceptive pill.

It may seem like the civilised thing to do, but a study has found being friends with an ex is not good for a new relationship.

Most women will disagree. But as his last child leaves for university, Brian Viner argues that it's tougher for dads.

How Brad Pitt and Angelina Jolie clashed over raising their kids and the impact divorce will have on them.

A survey has uncovered some surprising insights into what men really want from women when it comes to dating online.

COMMENT: A divorce like Brangelina's is both the end of a pleasant dream, and in the end, a bit reassuring for anyone in a marriage.

Married women reveal the most shocking and bizarre things their husband's mother said to them before they married, on a secret sharing app.

They were brought together by death, but yesterday a Hamilton couple declared their undying love for each other.

So you've got a guy, you are plotting what dress you'll wear down the aisle - but are you absolutely certain that he's the one?

A 13-year-old and her mum created a hilarious text exchange in the process of buying her very first box of tampons at her local supermarket.

While the ceremony may be spectacular, and the photos may allude to Hollywood-style wedded bliss, destination nuptials come with some serious baggage.