Women moan for different reasons during sex. First of all it is a rhythmically way [an error occurred while processing this directive] of communicating or expressing excitement and pleasure. Some women moan as a signal to let their partner know that the sensation feels good. Others utter sounds and let their bodies move freely as they "lose control" and allow themselves to be part of the sexual and satisfying experience. Movies, television, and music present us with idealized sex scenes or lyrics of people moaning and panting at the height of passion. In reality, some people are vocal and may moan and groan, other folks may muffle any sounds with a pillow, and yet others may not make a single peep. Some express themselves by twitching or moving their bodies rhythmically as a response to sexual pleasure.
People moan not only when they have intercourse. Some people make small sounds while kissing, giving or receiving a massage, or snuggling. Others don't have to be sexually excited to make a sound. While humans don't typically purr, some people may make a soft moaning sound when their hair or head is stroked just like a cat might if it were being petted.
Even though moaning is usually an expression of the pleasure and satisfaction, it may not remain the same always. When having a wild sex she may moan out of pain also. When stroked the most sensitive parts of a women with all the wildness of male power she may moan, in fact weep, out of helplessness and pain.
Studies prove that moaning during sex has greater impact on both the partners. If a woman moan to release the stress and express the pleasure, listening to the voice of the partner makes men more energised and awaken. It's definitely nice to know how your partner is feeling during sex. If a girl moan during sex out of pleasure it a certificate to the skills of the male partner to satisfy a girl and provide her pleasure. Moaning is a statement that she enjoys the act and wants more of the sort.
Making love to a 'motionless' or 'voiceless' mate is like having it with a dead body. Moaning and groaning makes the act more active and the male mate will feel the involvement of his female partner. Some women feel moaning and and groaning is like being uninhibited and making yourself totally vulnerable in front of your mate. But, in fact, moaning, just like any other sexual act, has it's own role in sexual pleasure.
Some women even fake moaning to just make their men know that they are enjoying the pleasure when they may not be into such deep pleasure. What ever it be, men like when his mate moan when he is busy with the action. Sex is an act of mutual involvement of two physical bodies as well as two minds. Moaning lets the other one know the intensity of pleasure he is able to provide to his lady mate.