Help finding a vaginal lubricant?

I have been experiencing frequent vaginal yeast infections over the past year. I read that men can be carriers without showing symptoms; so my boyfriend is going to go to the doctors to get treated. I also read on several web-sites that a lot of friction during intercourse can make yeast infections worse. My boyfriend is large and we often have trouble getting things to fit during sex. We have tried several types of KY-lube: warming, flavored, regular, etc. None of them work that well and they sting or burn after sex (especially the warming). We have tried putting it directly inside me and putting it on him; neither one really yields results. I was wondering if there was any type of lubricant that is compatible with sensitive skin and will work well to prevent soreness after sex.