If you don't make him wear a condom you're a lucky woman!
Everytime he cums inside you carefully navigate off of his cock using your hand to catch any semen that drips out then squat over his face and either push his semen out and give him a facial or better yet make him lick you clean and bring you to orgasm after he's done.
Train him to do this all the time so you never have to worry about making a mess in your panties after sex.
plus the feeling of his tongue cleaning you will feel incredible!