What sort of top are you talking about?
Anal sex top? Oral sex top? Bondage top? SM top? B&D Top? There's more than one way to be a top and it does not just mean the giver/penetrator for anal intercourse.
You can have sex just fine without any anal sex at all (i.e. fingers, rimming, toys, fucking, and fisting), and it does not matter if you're both anal sex tops or anal sex bottoms or anything like that.