Everyday Muscle.

Pubococcygeus (Superficial)

The main muscle behind Kegel exercises — strengthening it helps with urinary control and pelvic support.
Function
Supports pelvic organs, constricts urethra/vagina/rectum
Origin
Posterior surface of pubic body
Insertion
Anococcygeal raphe and coccyx
Innervation
Branches of S3-S4 (pudendal nerve and direct branches)