▁de formation ▁of ▁the ▁pel vic ▁floor ▁occur ▁during ▁a ▁v ag inal ▁delivery . ▁Appro xim ately ▁ 8 5 % ▁of ▁women ▁have ▁some ▁per ine al ▁te ar ▁during ▁a ▁v ag inal ▁delivery ▁and ▁in ▁about ▁ 6 9 % ▁s ut uring ▁is ▁required . ▁Ob st et ric ▁per ine al ▁tra uma ▁cont ributes ▁to ▁post part um ▁mor bid ity ▁and ▁fr ustration ▁of ▁women ▁after ▁delivery . ▁In ▁many ▁women ▁the ▁child b irth ▁tra uma ▁is ▁manif ested ▁in ▁advanced ▁age ▁when ▁the ▁compens atory ▁mechan isms ▁of ▁the ▁pel vic ▁floor ▁become ▁weak ened ▁making ▁the ▁problem ▁more ▁serious ▁among ▁the ▁aged ▁population . ▁ ▁The ▁an ogen ital ▁distance ▁is ▁a ▁measure ▁of ▁the ▁distance ▁between ▁the ▁mid point ▁of ▁the ▁an us ▁and ▁the ▁unders ide ▁of ▁the ▁sc rot um ▁or ▁the ▁v ag ina . ▁Studies ▁show ▁that ▁the ▁human ▁per ine um ▁is ▁twice ▁as ▁long ▁in ▁males ▁as ▁in ▁females . ▁Me as uring ▁the ▁an ogen ital ▁distance ▁in ▁ne on atal ▁humans ▁has ▁been ▁suggested ▁as ▁a ▁non in vas ive ▁method ▁to ▁determine ▁male ▁femin isation ▁and ▁thereby ▁predict ▁ne on atal ▁and ▁adult ▁re product ive ▁dis orders . ▁ ▁There ▁are ▁claims ▁that ▁sometimes ▁the ▁per ine um ▁is ▁excess ively ▁rep a ired ▁after ▁child b irth , ▁using ▁a ▁so - called ▁" hus band ▁st itch " ▁and ▁that ▁this ▁can ▁increase ▁v ag inal ▁tight ness ▁or