My boyfriend won't stop bugging me about dirty things

He'll ask me questions about my boobs and stuff, and he wants pics, but I'm just not interested in sending him anything, or receiving anything. I love him soooo much, but I'm just not interested in him sexually. I've told him I'm not comfortable and I want him to stop, but he won't listen. I wanna be firm with him about it, and I also don't want to hurt his feelings, but I'm wondering if I should break up with him, or is there a way I can make him stop???