A lot of men get the idea of anal sex from porn. There are many porno's out there that glorify anal penetration and if a man gets this in his head then sometimes he wants to try it. I mean, the women in the porns like it so why shouldn't his woman?! I also think that to some men it's so much safer, as a woman can't really get pregnant from anal sex. It's also risque (sp?---as in something not everyone does) so it's kind of uncharted territory. I have been with my husband for 6 years and he asks me all the time and I tell him it's not something I'm into. He understands.
Back during the Greek and Roman times anal sex was rampant. Between men and boys, men and women, it really didn't matter. It's not all a new thing, it goes way back. Spartan warriors would have anal sex with the little boys that were recruited for the army. This was seen as a way to get close to their fellow warriors. The closer you are to your fellow warriors, the more "together" things will be on the battle field.
Anal sex is not easily attainable. The man MUST go very slow and lube must be used. This is not a hole that things are used to going IN to. Those muscles are going to need to be relaxed before anything can happen.
You don't have to do anything that you don't want to do or don't believe in. Talk with him about it and let him know how you feel. If you are considering it, talk it over together about how to do it, and maybe do some research on what to do and not to do.
Also, there are many health risks associated with anal sex. I think you should be aware of them. Aids can be passed through this kind of sex. Many other diseases as well. You also don't want to go from anal to vaginal without cleaning because infections can arise.
I guess in short I am trying to say that ultimately if you want to do it it's your choice, it's not painless by ANY means and it's also not safer than vaginal (minus the pregnancy thing). Make sure you use something to suction all the "stuff" out before penetration. Use a condom to help avoid infections and diseases but be aware that protection can't completely prevent anything. If you don't like it, don't do it.