Ob-Gyn questions? Ask a gynecologist online.
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how old are you?
have you been sexually active recently?
have you had this pulled muscle before?
you could have a laceration in your vaginal wall.
was the sexual activity rough or prolonged?
this can cause vaginal lacerations or trauma or strained muscles in your pelvic floor
you could have pulled a groin muscle
if you don't stretch your groin muscle, you can strain your groin muscle
this can happen with sex
since your legs can be open during sex.
you may benefit from gentle stretching and strengthening of your groin muscle.