Suggest Treatment For Cracks On Inner Labia

I am 33 tomorrow, 5'6", 130 lbs, with a highly sensitive vaginal area...I have a new sex partner, who is engaging me in a lot more sexual intercourse than I am accustomed to (multiple time a day, every day). As a result, my inner labia appears to have cracked from chafing, and it is highly painful while urinating or wiping thereafter. It isn't anywhere near my vagina (relatively speaking) - located in the front of the inner labia, there is no irregular or foul smelling discharge, I am not experiencing frequent urination (thank goodness), and although it was previously itchy, that is no longer an issue. How do I best heal these cracks and prevent them from recurring? I don't want to aggravate the condition by upsetting the pH level.