How can we explain lesions in areas where there is no friction during sexual contact?

People with warts frequently have lesions in other regions, such as the pubic region, groin and elsewhere. Sometimes shaving these areas or hair removal creates micro-abrasions which allow HPVs to penetrate and infect the basal layer of the epithelium. Also, friction of a region (such as the anus) with infected fingers/fingernails can be the cause of lesions (in this case without actual anal contact).