As you can see, a couple having anal sex is not that big a thing on this site... the bigger issue is communication. Not letting him feel like there was breathing room from your parents is tough. It can kill the libido and the vibe. Give him a moment to breathe. And I think it is FAIR to not just be in a relationship if it is going nowhere, but it's best to judge by how you all feel together. Then, talk about the future and see how it goes... See if he can at least talk a year ahead. If not, and you want to... then you may need time off... Marriage is a big step and I think it is right to take one's time...
And please, if you get drunk and try something new don't feel bad... You are two consenting/loving partners (right?).