Excitation, Plateau Phase, Orgasm and Resolution are the four stages how sexual functioning takes place in our body. These stages vary from individual to individual and the time spent on each stage can vary dramatically.
1. Excitation: The erection of the penis is contributed with the accumulation of blood in the pelvic area during early sexual arousal. The intensity of sexual stimuli is responsible for the degree of erection. When enough blood does not flow to the penis due to the restriction of blood flow then it is difficult to achieve or maintain an erection.
2. Plateau Phase: Towards the glans or head of the penis there is a slight increase in size in this stage. Muscular tension heightens considerably and involuntary body movements increase as orgasm approaches. During this stage, a small amount of “pre-cum” fluid is opened at the urethra by the Cowper’s gland.
3. Orgasm: The ejaculation of semen from the penis is noticed during orgasm. Contraction of muscles at the base of the penis and around the anus takes place. Orgasm and Ejaculation occur at about the same time.
4. Resolution: In this stage the male body begins to return to its unexcited state. Half of the penile erection is lost away and the remaining is lost over a long period of time.
