How I can explain this to my husband?

I agree with Mary! I'm a man and I LOVE foreplay. I LOVE touching, smelling, and especially "giving' oral to a woman. You have to remember that you're the woman. YOU are the one in control here. As he matures he will appreciate going slow, but right now he has different priorities. Make giving you oral fun for him. Do you moan a lot? Do you praise him when he's doing the right thing? Do you ever roll onto your belly, give him the evil eye and tell him not to stop now? Do all the above, then when he's ready, make him roll onto is back and then sit on his face. Keep it prolonged as long as possible until YOU are ready for penetration. There's nothing more stimulating that listening to the ecstatic moans of a woman while going down on her!