Anal is not something to be taken lightly for those just getting into it, or for seasoned veterans. My dom has me use a butt plug daily to make sure I become more comfortable with the idea of anal penetration, before we have sex. It's almost like a mind over matter dealio with me. It can be amazing if done right, but if done wrong, it could not only hurt, but also there might be health problems if any ripping occurs internally. So like many people said use enough lube to make things as comfortable as possible, and there are things available to ease you into it. I find vibrating plugs work wonders, or you can find some anal lubricants that desensitize a little bit for anyone that finds anal a bit too much to handle at first. After a while, it gets more comfortable and your body no longer panics.

It is much fun and my dom enjoys himself immensely. I am just glad I was blessed with one who takes my comfort zones and interests heavily into account.