How to make him understand or just figure out that I love sex?

before you have sex, get married. but if u wanna get it through to him that you like sex and you would be 'good' in bed, just play truth or dare (sexy edition). make little cards that you two have to pick up and do (dare) or answer (truth) make one of your questions,' are u good in bed, and do you like sex ' then thats how you can answer.