Welcome to the ehealthforum and I am glad to help you out.
Since the ultrasound has come out normal, most of the medical causes have been ruled out. In your case, it looks like you are not able to have an orgasm because of psychological causes or hormonal problems. Changes in the hormone levels can also cause dryness of the vagina and hence produce anorgasmia(lack of orgasm). Other causes are stress and anxiety, alcohol and drugs, relationship issues and medicines like blood pressure medications, antihistamines and antidepressants.
Talk to your partner openly about any fears or apprehensions, eat nutritious healthy food, exercise regularly and cut down on smoking or alcohol if you are taking it. Also, ask your partner to indulge in plenty of foreplay or use a water based lubricant. If there is still a problem, then please get your hormonal assay done from an endocrinologist.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For an exact diagnosis, you are advised to consult your doctor. I sincerely hope that helps. Take care.
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