My boyfriend and I have been together almost 9 years and he loves penetrating my anus, at first it hurts really bad; it feels like he's stretching my skin to the point it feels like my skin is ripping apart. We've done this before and it's the same every time we stop for a while, I used to bleed a little like its the first time but now it doesn't. I just wanted to know if it is safe every time we have sex.