LS- is short for Lichen sclerosus (aka lichen sclerosis or lichen sclerosis et atrophicus) is a painful skin condition that typically affects the vulva (or penis) and anus. In women, LS falls under the general category of vulvodynia (chronic vulvar pain). It is not a contagious condition.
The current crop of misogynist politicians consider any prescription for birth control pills to be little more than a slut license, in effect giving young women permission to be promiscuous.