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Why do couples kiss on lips?

What is important with lip-on-lip kissing and other types of kissing is that the moment is about sharing close, intimate information about each other. Kissing by pressing our lips together is an almost uniquely human behaviour.

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"But I think the key to the human universal of kissing, or the absence of it, is that people's sensuality can be met in many ways other than just kissing," says Jankowiak. Those cultures that do not kiss lip on lip find other ways to be intimate, says author Sheril Kirshenbaum. "There's the Malay kiss that Darwin described, where women would squat down on the ground and men would kind of hang over them and take a quick sniff of each other – take a sample of their partner’s scent." On the Trobriand Islands, off the east coast of Papua New Guinea, lovers kiss by sitting face to face and nibbling at each other's eyelashes, "which I think to many of us today doesn't sound like the height of romance but for them that did the trick", says Kirshenbaum. What is important with lip-on-lip kissing and other types of kissing is that the moment is about sharing close, intimate information about each other.

Kissing by pressing our lips together is an almost uniquely human behaviour. If kissing has an evolutionary purpose, why don't we see more animals kissing?

Melissa Hogenboom answered that question for BBC Earth in 2015. One of the reasons we might have been compelled to get up close to the face of a partner is to give them a good sniff. Scent can reveal all sorts of useful information: diet, presence of disease, mood and relatedness, to name some. Many animals have far more sophisticated senses of smell than we do, so they don’t have to be nearly as close. * William Park is a senior journalist for BBC Future and tweets at @williamhpark

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How do you know if someone is good for you?

"A good sign that someone is right for you is if you can imagine that person fitting in to other parts of your life and not just living in a microcosm of the relationship. Ask yourself: Do they get along with the other people in my life? Do I get along with their friends and family?

If you already have a partner, congratulations, you've beaten the system.

For the rest of us, modern dating is a minefield. There are so many rules and games to play it's easy to lose track. You might be "left on read" by someone you really liked, and your mind may spin out of control when you're over-analysing what their last few messages really meant.

The woes don't necessarily stop when you find someone. With Tinder right at your fingertips, it's tempting to go back and see if there is someone out there who is just a bit more perfect. With so much available choice, how are you supposed to know if someone is right for you? When should you stop over-thinking and finally commit?

Business Insider asked nine relationship experts for the signs to look out for when you're trying to figure out if someone is right for you.

Here's what they said:

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