Double standards or just nerves?

Hello everyone! I can already predict the responses I'm going to get, but please try and understand. 
My boyfriend and I have been together for 2 years now. We've lived together and are currently saving up to buy a house. Safe to say we plan to spend our lives together. 
Sex is great. He really makes me feel beautiful. 
When we first started dating we got it all out on the table, all of our fantasies and the dirty things we're into. I must've left out getting eaten out. 
As our relationship progressed, he still hadn't done it and is really more of a shy conservative guy, especially when it comes to talking about sex, because he's only ever been with one other girl (and he's 26). I've mentioned it here and there, asking why he doesn't do it or like it, until I found out he's never done it before....
My question is: although it's not a deal breaker for me (I love this man and he is quite the captain of his own ship😏), I do want to make him feel comfortable enough and be able to do more together. How do I go about this? 

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