The genital muscles, including the uterus and introitus, experience rhythmic contractions around 0.
Contractions in the pelvic floor muscles and prostate gland also cause the semen to be forced out of the penis in a process called ejaculation.
You might even want to see a counselor with your partner.
A single, overarching explanation of the orgasm does not currently exist.
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The amount of semen that you ejaculate will get less as you get older but this is nothing to worry about.
The clitoris pulls back against the pubic bone, seemingly disappearing.