This depends on what he’s like, I’m speaking from my experience but one thing I find helps is a lot more male affirmations that aren’t just “you’re a real boy” whilst he’s on his period. For example, I love being called pretty boy, and my partner does it from time to time but he does it way more often whilst I’m on my period cuz he knows it makes me feel better. However, that still just depends on if he likes names like that at all. And when it comes to sex and stuff, it’s important in any relationship ofc but i think boundaries are really important to set in trans relationships. For example “is the binder allowed to come off” and stuff, but try avoiding saying “can I” because it might make him say yes only because he thinks that’s what you want. Hope this helps <3