Question about anal..

So I'm not a fan of anal at all. My boyfriend insisted on it so we tried like two times but without lube and it hurt like a bitch I hated it. However he liked it and now he wants to try again with lube as well as ejaculating inside. I'm not excited about it ... I was just wondering if anyone else experienced the same thing. How do you feel about him ejaxulatinf inside? And how can I prepare for anal ( paranoid that he's gonna have poop on him or something).. Thanks :)