Orgasm 💦

He always tries to but he can never make me cum/orgasm. Saying that I can't even make myself. When he tries my legs just tense up and start shaking and I can't let him carry on? I don't know if it's just me its not like I don't want him to carry on but my body physically won't let me I just start twitching and stuff when he does. It annoys him because I make him finish and he doesn't feel good when he can't make me.. 

Any tips?