Physical attractiveness refers to the degree to which a person's physical traits are regarded as aesthetically pleasing or beautiful. The term often implies sexual attractiveness or desirability, but can also be distinct from the two; for example, humans may regard the young as attractive for various reasons, but without sexual attraction.
Generally in new relationships, partners are matched in terms of relative physical attractiveness. And the more attractive their partner is, the more satisfied a person is in their relationships. Men place a higher significance on the physical attractiveness of their partner, than do women although women still count the physical appearance of their partner as important. Overall, physical attractiveness has a positive effect in new relationships — the higher it is, relatively speaking, the better both partners rate their relationship.
Even though the previous points are well known in the realm of attraction psychology still you will find many people dating others who don't have many of these features.
This doesn't mean that the previous points are wrong but it only means that there are many factors that affect the overall attractiveness of a person other than the ones mentioned.
the below links will give you more information about the psychology of physical attractiveness and help you understand why the perception of beauty might change from one person to another.
Physical attractiveness can have a huge effect on how people are judged people tend to attribute positive characteristics such as intelligence and honesty to attractive people without consciously realizing it. This fact lends credence to the "hard-wiring," evolutionary development theory. Regardless of the origins of the positive attribution, and as methods for altering one's appearance become more common place, there may well be an increasing trend to improve one's lot in life through artificial manipulation. In fact, this trend is already quite apparent in the case of plastic surgery which is now a multi-billion dollar industry. And there is no reason to believe that people will not afford themselves the benefit of such alterations on behalf of their children as germ-line engineering becomes more prevalent.
These basic signals dilate pupils, redden the skin, wet the lips and arouse base human instincts. That desire is to lead to the wish to have sex. The issue is that these signals are being eroded by well-meaning campaigners who say that looks should not matter. I am not really very good looking in my own opinion but I do know what I look like. And I do know who and what I am attracted to. I am sometimes called shallow because I go for a certain look for my dates. But the point is that these looks are what I find attractive and I tend to go for people who go for my kind of looks, thus increasing the chance of dating success.
Physical attraction is quite important in any relationship. One young man once said that he is prepared to suffer any hell in the hands of his wife, provided she is a beauty to walk the road with and make others jealous. There is a popular saying that "the eye must first eat of any delicacy before the mouth". This is a way used to express the feelings people have in their hearts about the place of physical beauty or attraction, especially the relationship of the sexes.
However, smiling is not the only sign of physical attraction. Another prominent sign that someone may be attracted to you is excessive staring. The saying not to stare that was taught by so many mothers over the years, pretty much gets thrown out the window when you find yourself attracted to someone. You stare as a means to analyze the person. Their overall beauty creates an awe inspiring sense to stare. Anytime that someone notices something that they like, you will notice they will consistently stare at it as a means to evaluate what they truly like about it.
By identifying certain signs of attraction, you may feel confident in taking things to a deeper level of intimacy. When someone catches your eye and you find yourself physically attracted to them, you might wonder if they feel the same way.
Prolonged eye contact
This is the best way to attract attention and indicate that you are noticing the other person. Because eye contact is a very personal thing, it isn't done often or for long in polite society. Eye contact should be friendly and accompanied by a smile.
Gently biting or licking the lips is a subtle way to indicate desire. The lips are very sensitive and an important body part when it comes to intimacy. This kind of attention to the lips makes them redder and more moist-a universally attractive quality. Men might purse their lips together in a subtle manner, while a woman may bring her necklace up to playfully toy with.
Crossing the legs
When a woman crosses and uncrosses her legs, it draws attention to her legs and groin area. When the gesture is made with an adjustment to clothing, such as to arrange a skirt to show more skin, it's an unmistakable message that someone finds you attractive. Men often don't sit with their legs crossed, but may sit or stand with their thumbs tucked into their belt loops, subconsciously drawing attention to the groin area.
When he touches your hand, arm or shoulder, it's a sign that he's eager for physical contact. It may progress to gentle caressing or touching your hair. Some people rhythmically caress themselves, such as rubbing their arm or neck, in a subconscious attempt to show that they are interested in getting physical.
Nothing says intimacy like how far from each other you are. If he's constantly leaning in to you, whispering in your ear, squeezing next to you in a crowded room or putting his arms around you, then the attraction is stronger than ever. Similarly, women might position themselves to be close to a man's chest or shoulder so she can lean on it flirtatiously. Whispering secrets is a thrilling and intimate way to communicate interest as well.
The general topic of attractiveness is important to members of virtually every culture, especially to the young who seek romantic partners and to those who seek to extend their influence in society through contact with others. Attractiveness is significant to each individual and to most people whom the person meets, and the effects of attractiveness could extend to virtually every other impression a person makes. Attractiveness to a psychologist means how others perceive and rate the desireability of a person's features. Such ratings or opinions depend partly on inherent physical attractiveness of the facial features and partly on other factors, for example, how these features are "packaged" or presented. Given the importance of physical beauty to perceived attractiveness, purveyors of aids and accessories for enhancing physical attractiveness make every effort in consumer-oriented societies to emphasize this aspect of attractiveness. The face is a focus of much attention when it comes to physical attractiveness, because this part of the body represents the person's identity and is most exposed to public view.
Your body speaks its own language, but you probably already knew that. You know that a frown symbolizes unhappiness, while a smile is usually a pleasant thing. The truth of the matter is that your body language can go beyond simply gestures to a much deeper level. The human nose can pick up on pheromones, chemicals that your body gives off when you are feeling something, whether it is attraction, arousal, interest or disdain, and you can bet that the people around you, whether they know it or not, are picking up on them. Now what you need to know is how to control them!
To figure out how we pick mates, scientists have measured every shape and angle of the human face, studied the symmetry of dancers, crafted formulas from the measurements of Playboy models, and had both men and women rank attractiveness based on smelling armpit sweat.
After all this and more, the rules of attraction for the human species are still not clearly understood. How it all factors into true love is even more mysterious.
But a short list of scientific rules for the game of love is emerging. Some are as clearly defined as the prominent, feminine eyes of a supermodel or the desirable hips of a well-built man. Other rules work at the subconscious level, motivating us to action for evolutionary reasons that are tucked inside clouds of infatuation.