Hi, ive been having sex with my gf numerous times daily without condoms for the past three months, we didnt have sex for a few days and yesterday and today my sperm is burning her and stinging like crazy, it last or approx 30mins full on and calms a bit, neither of us have any infections and this is a problem she has had before, the only thing that has occurrd different is i had a heavy night drinking alcohol a few days back, could it have affected the ph level or something? Thank you