I've been having sex with my girlfriend for awhile now and just recently, I have been getting friction burns on the left side of the shaft. I can feel when it happens. It is worse when she has not shaved in awhile. It still hurts a little when she has shaved recently, but not as much. I think it rubs on the stubble because I feel it when I go out a bit. I don't know why this has just happened recently and not before. I know that we've used condoms less, but that was a month ago. We've tried lube, but that doesn't really help. It seems to be only in doggy style that it happens. Any ideas?