Arousal is an integral part of human sexual experience, characterized by physiological changes that occur in response to external stimuli. These physiological changes include increased heart rate, breathing, and blood flow to certain areas of the body. As these physical changes progress, they can lead to muscle contractions throughout the entire body which result in orgasm.
When a person experiences arousal, their muscles begin to contract involuntarily and tighten up due to increased levels of adrenaline, dopamine, noradrenaline, oxytocin, serotonin, testosterone, and estrogen. This process is known as tension building and it serves to heighten the anticipation of pleasure during intercourse. As this occurs, blood vessels within the genitals become engorged with blood while other parts of the body are deprived of nutrients. This creates a feeling of fullness and pressure within the vagina or penis that increases pleasure.
Throughout this process, various muscle groups within the body are affected including those in the pelvic floor, abdomen, legs, arms, hands, neck, back, chest, face, and even jaw. The degree to which different muscle groups are impacted depends upon each individual's unique arousal patterns and preferences for sensation during sex. For example, some individuals may experience strong leg muscle contractions while others may not feel much at all from them. Similarly, some people may experience facial expressions such as grimacing or smiling while others remain relatively expressionless.
The culmination of these muscular contractions results in an intense release of energy known as orgasm. During this time, most people will feel a wave of pleasure followed by a sense of euphoria or satisfaction. Some may also experience visual or auditory hallucinations along with physical sensations such as shaking or trembling. Afterwards, there is typically a period of relaxation as hormones such as dopamine return to baseline levels.
In conclusion, arousal causes muscles throughout the body to tense and then relax during orgasm. This process involves several physiological changes that lead to heightened pleasure and sexual gratification. Different people can experience varying degrees of muscle contraction based on their own personal arousal patterns and preferences. Understanding how your body responds to stimuli during arousal can help you maximize its potential benefits for yourself and your partner(s).