If married and husband wants sex a lot, do you have to submit?

Maybe. Sexual interaction between two people involves normal differences in desire, frequency, and techniques. Like anything else in relationships, it is a form of communication which is "negotiable" and involves compromise. Please have that "conversation" with your partner soon.
Try this... Communication is the key. This guy chose you out of all the women in the world and promised he'd be with you, and only with you. Things will go much better in many aspects of your marriage if you do everything you can to make each other happy. Especially, try a lot of different things & tell him what you like best. Criticize as little as you can. Keep falling in love again & again.