How to approach this….

I have been with my new boyfriend for a month now, and we met in late January. He (36,M) is a civil engineer and I (34,F) am a kindergarten teacher. There are a few points I was thinking of discussing with him, I’m just wondering what the best approach would be to discuss what’s on my mind and to check in with him.
1. His use of advanced vocabulary: I admire and appreciate someone who has an extensive vocabulary. We are both self-proclaimed nerds and enjoy reading and discussing various topics. Ever since I met him I’ve noticed that he uses a very high level vocabulary in his regular conversations, even around his close friends and family such as his brother. This doesn’t bother me since I do understand what he’s saying. However, I do wonder if there’s ever going to be a time when he “lets his hair down” and relaxes with his vocabulary. There’s times when it’s just me and him lounging around and he’ll say things like “so and so opines…” or he’ll say to me “you’re just so even-keeled”. I’ve never heard him use slang words, which I do use sometimes. I’ll say things like “chill” or “sus” and I’d like to understand his approach to language/vocabulary just out of curiosity. I also don’t know if I’m being insensitive or if I should just let this go. I haven’t said anything to him about it so far. Maybe that’s the way he talks at work? I just don’t know.
2. Intimacy: I know that with a new partner, it takes time to find your groove. I’d like to find a way to talk about my preferences without making him feel bad since I do enjoy our intimate time. I would like to tell him I prefer more assertiveness and different positions. We tend to do missionary or me on top. Sometimes he’ll want to go from behind and while these are all very enjoyable positions, I want to tell him I’d like a little more “roughness” and a little harder. The first time we had sex, things were getting hot and heavy and at one point right after he put on the condom, he very bluntly asked me “do you need lube?”. I think he thought he was being considerate, which I do appreciate, but I found it a bit interesting that he didn’t think to ensure I was ready or do something to get me there, which I guess I could have said but since it was the first time I thought I would let it go and if it happened again I would bring it up. He has since discovered that I don’t need lube and hasn’t asked that again. I do want to check in about his preferences too, since I am open to feedback and improving intimacy for both of us.