Just to clarify - are you saying you do or don't like anal for Alison?
Because if you do like it (which is what I assume), I'm thinking that anal may be something that Alison eventually come around to, although it could be a while.
I know Alison said she doesn't like anal and won't do it, but we know that Alison starts out kinda conservative, both in the way she dresses and the way she handles sex, but we also see that she is both eager to please Ian (barking like a dog during sex, which I don't think any of us were expecting) and willing to bend to Ian's will in her attempt to keep him close (first being angry when he came inside her despite her telling him not to, then accepting it, and eventually admitting it was really hot - possibly loving to do it in future). We also see how much she insists on being the focus of Ian's attention, either by cutting in on his conversations with other people, or by changing up the way she dresses when Ian comments that he finds Cherry's outfit sexy (and it's sexier then what she's wearing). A lot of what she does is an attempt to have Ian completely to herself and only looking at her - she's nuts about him. So it doesn't seem impossible that her strict stance on 'no anal' might slip down the track, especially if she finds out that Ian has done it with other girls, and/or that he really likes it.