Where do you get sore? Frenulum? Foreskin? Using lube, or extensive foreplay to warm your girl up can definitely help. And of course, abstinence will help - although I know no-one wants to hear that! I've been dealing with almost perpetual soreness for the past year or so, even though me and the gf weren't having sex that often (couple of times a week at most). But a full 2 weeks off recently really helped alleviate the problem.