And they may never report the incident to a doctor. Keep reading to learn more. For penis captivus to occur, a series of events during sex must take place. The penis, which fills with blood during an erection, may continue to grow in size before orgasm. The muscles inside the vagina may pulse slightly during an orgasm, too. On occasion, the vaginal muscles may contract more than typical. These contractions can narrow the vaginal opening.

Sexual intercourse is sex with penetration of the vagina or anus by a hard penis. A man who is aroused can get an erection. The penis swells with blood. It gets bigger and harder and it rises up. If you do not have a desire to have children at the moment, use contraception.

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