Anal Sex??

I have a lovely daddy at the moment and the 2nd time he came round he pushed his penis against my bum hole. I was very excited but also embarrassed and scared. I know i pushed my hole against him and i wanted him to put it in. It felt so dirty and fu**ing horny. I was too shy to tell him even though i know most men like this but i was really scared it would hurt or that i might get poo on him..is that normal and will it damage me there. I keep getting turned on thinking about it.