Right before orgasm there is a sense of ejaculatory inevitability for an instant. Many men have described the onset of this sensation as “feeling the ejaculation coming”. From the onset of this sensation there is a brief interval, two to three seconds at the most, during which a man feels the ejaculation coming but is no longer able to prevent, delay, or in any way control the process. This experience of inevitability develops as seminal fluid is collecting in the prostatic urethra, just before the actual emission of seminal fluid begins. While a woman’s orgasm can be interrupted by extraneous stimuli, once initiated, a man’s orgasm cannot be delayed until emission has been completed.
Just prior to ejaculation, the glans may change colour; its mottled, reddish purple colour may become darker. (This is reminiscent of the pre-orgasmic discoloration of the labia minora in a woman.) A drop of fluid may form at the urethral opening of the penis prior to ejaculation. This is not seminal fluid but secretions from Cowper’s glands. The size of the testes increases slightly and they also become elevated. At this point, it is increasingly difficult for the penis to return to its resting state without ejaculation.
Muscle contractions occur at a late stage of sexual excitement and may be involuntary or voluntary, depending on body position. Spasms of a man’s hands and feet can occur — rarely if the man is on top — but more commonly when he is supine.
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