How and when do you tell a guy to do something differently during sex becuase it's not doing anything for you without hurting his ego?

Like if his technique or something makes you think what is he doing? Maybe it will get better. Doesn't he see I'm not reacting at all? I'm not one to fake it.

I heard before to just nicely tell them what to do. I tried it before and the guy got mad, and said he knew how to whatever a woman. Well we're not all the same. But since then I'm at square one.

I've told someone else after the fact and he seemed to be ok. But his insecurities lead it to bring only 1 night.

How and when do you tell a guy to do something differently during sex becuase it's not doing anything for you without hurting his ego?
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