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Why do we 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 a guy doesn't love you?

He is no longer affectionate with you, physically or verbally. He no longer makes sweet or romantic gestures toward you. He doesn't say "I love you" anymore. He still says "I love you," but something about it feels hollow or forced, like he's just going through the motions.

If your husband says he is not in love with you, it's important to critically consider what you want to do and how you want to move forward. Importantly, the marriage doesn't have to be over if your husband is willing to work through this with you and wants to find ways to fall in love all over again. According to Henry, it's about recognizing the difference between being in love and loving someone. "Being in love doesn't equate to whether you love someone or not. I think being in love can be an ebb and flow, whereas loving someone should be more constant," she explains. "The marriage doesn't have to be over because feelings have changed. I think it's unrealistic to expect that the intensity or level of feeling will be the same over time because circumstances can have negative impacts on the relationship." Perhaps something has pulled you and your husband apart. But if you're both still committed to working on the relationship, it's possible to bounce back. On the flip side, if your husband knows his feelings won't change again—or he isn't willing to put in the effort to see—then it may be time to consider divorce. It's also worth noting—because many people may wonder—if your husband says he isn't in love with you anymore, Henry says it doesn't necessarily mean it's because he's in love with another person. There are many reasons people fall out of love, and most often it has to do with people simply growing apart. "Maybe he's going through a transition, or maybe you've changed without realizing it," she says. "In a marriage, partners need to communicate frequently because they are individual people growing at different rates."

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