Shared interests will often cement a relationship, as do shared values and opinions. Some couples seem made for each other - but there's an awful lot of couples that leave you wondering how they got together in the first place.

He votes Republican, she doesn't vote at all. She loves cats, he's allergic to them. He's a party animal, shed rather stay at home with a good book. You know these couples - they're everywhere. But what does the research say?

An article by David Partenheimer on the American Psychological Association's website outlines a comprehensive couples study by the University of Iowa. Psychologist Eva C. Klohnen, along with graduate student Shanhong Luo, looked at 291 newlywed couples to study “assortative mating issues” - which is coupling “based on similar or opposite characteristics”.

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Never waste your time browsing private sections of classified sites online, since it is the place where dishonest and clever marketers try to sell pills, adult webcams, dating membership and devices to enlarge male genitalia. If these sites are approached, many respond and most of them will be trying to vend something. These sites allow the customers to include the dating profile and fill out a simple form to use a webcam and then try to fool you, so be aware of them as if they were swine flu.