28 Mar When a woman has vaginal sex for the first time, it can be a little painful. There may also be a small amount of blood, but this isn't always the. 13 Oct In New Zealand, more than a hundred thousand of us suffer from this for symptoms to start in the teen years, sometimes from a girl's first period. Painful sex is a symptom of endometriosis too and if your periods are also. 3 Apr Although it wouldn't be drinking - that just causes pain and discomfort, too. will be times better; I can get on with being a normal teenage girl. that worked, the headaches, imbalance in hormones, the still-painful sex.