I'm a long time user but I have name changed for this one.
I have only ever had one sexual partner whom I have been with for 3 and a half years, we are married and have sex regularly, unless we have sex every other day the opening of my vagina gets really sore and red raw, after the birth of our son we are lucky if we have sex once a week and the pain afterwards just isn't worth it and it's putting me off sex entirely. He is not particularly girthy and I'm always well lubricated.
Is this just how it is? Do you have to have sex very regularly for it to just slide in and out without irritation? It's quite annoying as I do enjoy it while it's happening but afterwards it's just really sore.