There's nothing wrong with you. Some women simply orgasm much more easily with penetration that others.
As far as chemically, it is hard to tell what exactly causes an orgasm, and I'm not sure anyone is able to give a complete explanation of the process. However, experts know a little more about the physical changes that go along with having an orgasm. First of all, an orgasm is defined as the sudden discharge of accumulated sexual tension resulting in rhythmic muscular contractions in the pelvic region that produce intensely pleasurable sensations followed by rapid relaxation. It typically lasts for several seconds. Orgasms vary from person to person and for each individual at different times. Some orgasms may be explosive and amazing others may be milder and less intense. These differences in intensity may be attributed to many different factors that are physical (such as fatigue) as well as psychosocial (such as mood or expectations). As far as physiological components of orgasm, the most characteristic physical feature of orgasm is the sensation produced by the simultaneous rhythmic contractions of the pubococcygeus muscle (pc muscle). The pc muscle, anal sphincter, rectum and perineum contract to form an orgasm, along with the uterus and outer third of the vagina. Generally, the first few contractions are intense and close together, occurring at about 0.8-second intervals. As orgasm continues, the contractions diminish in intensity and duration and occur at less frequent intervals. Interestingly, it has been shown that orgasm is a total body response. Changes have been shown in brain wave patterns during orgasm, and muscles in many different areas of the body also contract at this time. Orgasms in men and women are fairly similar. The main difference is that far more women than men have the physical capability to have one or more additional orgasms within a short time without dropping below the plateau of sexual arousal.

thanks =]

Nihilist. Pessimist. Realist.

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