"Opposites attract" is a law of attraction, at least where electromagnetism is concerned. But are there laws about attraction between two people? "In a world that is full of strangers" as a line in a famous song of the 1980's goes, is there a clear set of rules that allows two people to fall for each other?

Is attraction a matter of chemistry?

Maybe. According to scientists, the attraction between animals of the opposite sex is all about chemicals called pheromones. The effect of pheromones in behavior of insects is the most studied to date. It has been observed, at least in some experiments, that pheromones are responsible for communication among same species and colony of ants. The horrible odor released by skunks to ward off enemies is said to be a kind of pheromone. Some species of apes rub pheromone-containing urine on the feet of potential mates to attract them. Some scientists believe that animals (usually the females) such as insects and mammals send out these chemical signals to tell the male of their species that their genes are different from theirs. This gene diversity is important in producing offspring with better chances of survival. The perfume industry has capitalized on pheromones as a means to increase one's sexual attractiveness to the opposite sex. Animals such as the whale and the musk deer were hunted down for these chemicals.

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Lately, scientists are looking into the existence of human pheromones and its role in mate selection. There are many conflicting views in the realm of biology, chemistry, genetics, and psychology. Most scientists would assert that these do not exist, or if they do, do not play a role in sexual attraction between a man and a woman. But new researches such as that conducted by Swiss researchers from the University of Bern led by Klaus Wedekind are slowly making these scientists rethink their stand. Their experiment involved women sniffing the cotton shirts of different men during their ovulation period. It was found out that women prefer the smell of men's shirts that were genetically different, but also shared similarities with the women's genes. This, like in the case of insects and other mammals, was to ensure better and healthier characteristics for their future children. But researchers also cautioned that preference for a male odor is affected by the women's ovulation period, the food that men eat, perfumes and other scented body products, and the use of contraceptive pills.

Does personality figure in sexual attraction?

Yes, but so does your perception of a potential mate's personality. According to a research conducted by Klohnen, E.C., & S. Luo in 2003 on interpersonal attraction and personality, a person's sense of self-security and at least the person's perception of his/her partner were found to be strong determinants of attraction in hypothetical situations. What does this tell us? We prefer a certain personality type, which attracts you to a person. But aside from the actual personality of the person, which can only be verified through close interaction through time, it is your perception of your potential partner that attracts you to him/her, whether the person of your affection truly has that kind of personality or not. This could probably account for a statement commonly heard from men and women on their failed relationships: "I thought he/she was this kind of person."