The term "orgasm" has been defined as "a reflex that occurs when muscle tension and blood flow to the pelvis reach a peak and are dispersed". The male orgasm is generally accompanied by spasms in the pelvic muscles, an increase in the heart rate and blood pressure, and rapid breathing.

The male orgasm is also usually accompanied by ejaculation, during which semen (the fluid that contains sperm) is ejected from the penis.

However, researchers have found that ejaculation and orgasm are actually two entirely different things.  In the words of one writer, ejaculation is "the mechanical side of the male climax" and orgasm is "the sensory expression". It has also been noted that ejaculation is a "localized genital sensation," while orgasm is a "full-body" experience. Because ejaculation is separate from orgasm, it is possible for men to experience multiple orgasms during sex. Despite this, "most men feel sexually satiated with one orgasm".

Orgasm is actually one of five stages in the overall physical response to sexual stimulation. During the first stage, the excitement phase, the man becomes stimulated, attains an erection, and experiences an increase in muscle tension and heart rate. The second stage, the plateau, is basically a continuation of the excitement phase, but at a more consistent rate of arousal. Orgasm is the third stage of the sex-stimulation cycle. Right before the occurrence of orgasm, the male experiences a sensation known as "ejaculatory inevitability" (in other words, the distinct feeling that "orgasm is imminent"). The orgasm is followed by the resolution stage, during which the body returns to normal and the man feels tired from all the energy he has exerted. The fifth stage is known as the refractory stage.

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