Sexual intercourse - painful

It may be best to see the doctor together with your partner. Physical examination may include a pelvic examination (for women), a prostate examination (for men), and a rectal examination. If a physical problem is suspected, appropriate tests will be ordered.

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Antibiotics, painkillers, or hormones are amongst the treatment options that may be considered.

Prevention:

Good hygiene and routine medical care will help to some degree.
Adequate foreplay and stimulation will help to ensure proper lubrication of the vagina.
The use of a water-soluble lubricant like K-Y Jelly may also help. Vaseline should not be used as a sexual lubricant because it is not compatible with latex condoms (it causes them to break), it is not water soluble, and it may encourage vaginal infections.
Practicing safe sex can help prevent sexually transmitted diseases.

References:

National Institutes of Health. National Institutes of Health State-of-the-Science Conference statement: management of menopause-related symptoms. Ann Intern Med. 2005;142(12 Pt 1):1003-1013.

Klein MC, Kaczorowski J, Firoz T, Hubinette M, Jorgensen S, Gauthier R. A comparison of urinary and sexual outcomes in women experiencing vaginal and Caesarean births. J Obstet Gynaecol Can. 2005; 27(4): 332-339.

Mahutte NG. Medical management of endometriosis-associated pain. Obstet Gynecol Clin North Am. 2003; 30(1): 133-150.