The lingual frenulum (underside of the tongue) is vulnerable to ulceration by repeated friction during sexual activity ("cunnilingus tongue").[44] Ulceration of the lingual frenulum caused by cunnilingus is horizontal, the lesion corresponding to the contact of the under surface of the tongue with the edges of the lower front teeth when the tongue is in its most forward position. This type of lesion resolves in 7–10 days, but may recur with repeated performances.