Rare medical condition

A man and a woman were sitting beside each other in the first class section of an airplane.
The woman sneezed, took out a tissue, gently wiped her nose, then visibly shuddered for ten or fifteen seconds.
The man went back to reading his book. A few minutes later, the woman sneezed again, took a tissue, wiped her nose, then shuddered violently once more.
Although assuming the woman might have a cold, the man was still curious about the shuddering.
A few minutes passed when the woman sneezed yet again. As before she takes a tissue, wiped her nose, her body shaking even more than before.
Unable to restrain his curiosity, the man turned to the woman and said, I couldn't help but notice that you have sneezed three times, wiped your nose, and then shuddered violently. Are you OK?'
The woman replied, 'I am sorry if I disturbed you. I have a rare medical condition. Whenever I sneeze, I have an orgasm.'
The man, more than a bit embarrassed, was still curious. 'I have never heard of that condition before', he said. 'Are you taking anything for it?'

The woman nodded. 'Black pepper.'