help with orgasm

I've been seeing this guy for a while and we've had sex a few times but he can never get me to orgasm no matter what he does and I can tell he gets frustrated that I have to help him. Also the last time we had sex I was giving him a blowjob and he wouldn't orgasm at all for a long time so are there any tips at all to help? We've different positions and techniques but nothing seems to work for us