My boyfriend doesn't ejaculate, he says he practices tao sex but i'm clueless?

Tantric?: I think you mean tantric sex. You can find this in many search engines, and it often involves ejaculation delay or denial.

Ask him: I was clueless myself, so i looked it up on wikipedia (under "taoist sexual practices"), where there is a fascinating paragraph on male control of ejaculation. It sounds like a lot of work to me. Read about it, or better yet, ask your boyfriend. My experience from going to cocktail parties is that people who are into this kind of thing are usually very happy to talk about it!