Ok so me and my boyfriend have been doing anal lately because of my period. I have never done it before but we went slow and everything worked out fine. We have done it about 3-4 times already and my butthole is really sore. It hurts around the like rim of the butthole. Not inside tho at all just around the rim/ the beginning of the butthole/ the visible part. And then we were about to do it again and he stopped because he said there was a little bit of blood around the rim. Is this normal? Am I doing something wrong? Help