You really need to have a long conversation with your husband about your sexual needs. Explain what you need from him, what he should let you do. Remind him how much pleasure he will feel, how much pleasure he will give you. Sexual incompatibility always leads to unhappiness and likely breakups. Good luck. He doesn't seem to understand what a gem he has.
Hope my husband thought the same. He never let me suck his cock I've been wanting to experience facial and cum in mouth for a long time but my husband only fucks me. He never does Anal or fuck my face no matter how much I tell him