Could mean he had NO sex drive for anything boy girl, billy goat or whatever.
He did have a wife and children. During the nazi years, he had mistresses. So, he had some history sex drive. At the time of his capture, he was in his 50's and based on his year of birth, he was near the end of his life expectancy. His age combined with 15 years in hiding, combined with the stress (and depression) of being captured and held by the Israelis could understandably have eliminated any sex drive.
I don't think that is what the psychiatrists were trying to say.