Anal sex isn't for everyone. I personally like it. It doesn't mean that the guy that i am with is gay or anything like that. (ahem!!)
If your bf is attentive to your needs than it can be a wonderful thing. I am hoping that you and your boyfriend have an open mind. being clean is the key, you can do and enema and that way you will know that there shouldn't be anything left in there. you know?
Make it fun, not a chore, don't go into it like it's something that is going to be painful and dirty. It can be great and clean depending on the things you do before hand. Have him use his fingers first to prepair you, using lube (lots of it) of course. And let him know that he has to go at your pace, maybe even let you back up onto it....or even you on top so that you controle to depth at first.
Yes sometimes the skin between the vigina and the anus can be ripped...but it doesn't happen normally. So it is safe....as long as you both listen to each other.
Ok have fun, oh and remember that going front to back is fine but going back to front is not good.....leaves the door open for infections in your main little kitten....