I know first hand that black bulls can hurt you in anal intercourse.At 19yers I did not have much problems after sex and he was big for my 1st. Then two years ago a black bull and mom friend reintroduce me to nigger cock, again no real problems, some bleeding and sourness.On Christmas swing mom introduce me to my now "husband". At first he fuck me once a weekend at swing for three weeks , then he ask me over to his place, every night after that I was in heat.His mom even caught me moaning, naked ,pined down , his black cock spreading me open and my pink hole swallowing ever inch of his glassine phallus. I did not care what she saw ,we were at that point of no return and I wanted his seed deep in me. Things were good between his mom and me ,she knows her son's sex likes for white bois. She was at my wedding and I still call her mom.After the 1st few days I had a bad belly pain. My body was not use to the big black cock regularly fucking it and the doctor had to treat me for it.I now relax more, take Yoga and at time slow down some lovers. I give my son the same tips.