How do you tell your boyfriend that you want more out of your relationship?

Communication! You must be sharing many intimate things although you may not have had a sexual experience with this person yet. Still, by now you should be comfortable enough with each other to simply express to this person how you feel. Tell them you love them (if you do) and that you are ready for the next level in your relationship. If it's sexual and it's a woman and she's not ready I suggest you don't push her let her tell you when she's ready. Meanwhile, just enjoy each other. Merry Christmas Marcy