Help with anal sex?

My partner and I tried doing anal and it wasn't working out. I'm 5"3 and he's 6"1. I'm fit and flexible and I thought that would help. We used alot of lube and oil but I could take him in, I can barely take him in vaginally since he's big. But he's also not circumcised so it hurt a little at first for him. We both love exploring but idk, I just felt bad i couldn't take him in. Any suggestions?

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