My girlfriend and I have been dating for a year, and I love her very much. We have a mutually fulfilling sexual relationship, and we communicate well. Recently, I told her of my fantasy of her performing oral sex on me and swallowing my sperm. She said that would be "gross," and has never brought me to climax during oral sex because she does not want me to come in her mouth. I perform oral sex for her, and I enjoy having her sexual fluids on my face and tasting them. We have discussed sexual fantasies before and have pleased each other very much. But she will still not accept my sperm in her mouth, My question is: what must I do or say to make her change her mind, to make her understand how much I wish she'd do this ?