I am fairly new to sex, but I tried anal recently and enjoyed it. I now need to practice it on my own to see what I'll like, and to have a toy to use with my partner. Any advice on what I should get? Should I just get a dildo that's his size? I also could use some advice on lube. Will a water-based lube work? I know there are specialty anal lubes, but I was reading warnings about the numbing ones (benzocaine) often leading to injury, so I'm not too sure on those.