The clitoris is an organ solely devoted to bodily pleasure and important mood regulator in sexually awakened persons.
and lazy stimulation can be disappointing,
upsetting, and, if exercised repeatedly, bringing up the false notion
of anorgasmia (inability to achieve orgasm). Any enough hard to
be effective clitoral massage which ends in climaxing can cause
transient irritation (redness) of the area involved, enlargement and
colour intensification of labia minora.
Orgasms can cause pain for many other reasons too. As long ago as in 1974 Helen Singer Kaplan wrote: "... it is now believed by many authorities that all female orgasms are physiologically identical. They are triggered by stimulation of the clitoris and expressed by vaginal contractions. Accordingly, regradless of how friction is applied to the clitoris (...), female orgasm is probably almost always evoked by clitoral stimulation. However, it is always expressed by circumvaginal muscle discharge." If the uterus is in retroversion. i.e. tilted to the back it is not vaginal nor perineal but uterine contractions which cause a condition described by patients as pelvic discomfort, lower abdominal pain, backache, low back pain or painful cramps in the back during or after orgasm .
Two anatomical variants of the uterus.
An anteverted uterus tilted forwards (to the bladder), ascending during orgasm.
A retroverted uterus (aka retroflexed, tipped) tilted backwards (to the bowel), during orgasm not ascending but sometimes cramping painfully.
Defloration and intercourses offer no help if the retroverted uterus cramping occurs during orgasms. BTW: orgasmic contractions of the uterus speed up the movement of the sperm toward the egg to a record of 4 minutes.
Erection of the clitoris also known as clitoral tumescence