Tighten the muscles that surround the opening of the vagina and rectum as if you are trying not to urinate. (womenandinfants.org)
When the pelvic floor muscles are contracted, the internal organs are lifted and the sphincters tighten the openings of the vagina, anus and urethra. (pearltrees.com)
Vulvodynia is characterized by a burning, irritation, or sharp pain near the opening of the vagina. (uofmhealth.org)