Despite the diversity of sexual preferences, I think that sexual compatibility with a partner and especially a good dialogue on these subjects is essential. However, I think there is a limit beyond what is acceptable (which I wouldn't know what it is) that can become something toxic in your relationships.

For myself, I wouldn't be able to continue in a relationship without anal sex (and it's not even for the physical pleasure itself), because I would inevitably associate refusal with some notion of lack of trust, intimacy and commitment from the partner. I honestly can't even imagine this situation, it would certainly be terrible for my full sexual satisfaction and consequently the relationship health. Luckily I hit the lottery and found a gorgeous woman who likes anal sex even more than me. I think I should be grateful for that every day.

Still, even though I had found a rare gem of a wife, our anal-based sexual relationship was years in the making. I truly believe that a couple can develop this arrangement.