DEAR ZZINA POWER I have a confession; when we have s#x, my girlfriend’s legs shake and vibrate – but she insists she isn’t satisfied.

I’ve tried everything to make s#x great for her, including foreplay and talking dirty. But nothing works.

It’s not that I can’t last, either. If she wants to rest, I stop. Sometimes she likes it slow, so I take it slow.

I’m 28 and she’s 26. We’ve been together for two years and have a good relationship apart from this.

If I ask her what I can do to make s#x better for her, she can’t suggest anything different.

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I know she loves s#x with me. She just says she isn’t satisfied.

I looked online and the shaking legs mean she is having an orgasm, so I know I am doing a good job.

ZZINA POWER SAYS: It sounds as if you hit the spot perfectly. It is completely normal for your girlfriend’s legs to shake. During sex, tension builds around women’s muscles and not just in the genital area.

Orgasm comes as the muscles release, relax and then rhythmically contract. For some women, it’s not just the muscles in the genital area. Other parts of the body can shake and quiver.

Reassure your girlfriend the quivering is completely normal and hopefully, she can start to enjoy that post-orgasm feeling. My support pack Women And Orgasm explains more.