how to get anal to stop hurting??

Maddy
So my boyfriend is very into anal and the only time I let it happen for an extended period of time without it hurting was when I was feelin pretty buzzed after drinking and totally up for the idea. Ever since then every time we've tried it's hurt too much for me to let it go on for more than a minute. I actually really like the feeling of it it just hurts. We've used lots and lots of lube but I love the feeling and I want to give him that pleasure. Any tips on how to get myself to where it doesn't hurt??