We have never had a single case, ever. What I find remarkable is that the aliens have chosen instead to perform their exams using Earth kitchen equipment. Perhaps this explains the mysterious disappearance of a set of bumblebee-themed ceramic measuring cups from my childhood home in New Hampshire. Jacobs cleared his throat. It's a program of systematic exploitation of humans.
All men say sperm is taken.
All women who have ovaries say eggs are taken. The men, for their part, may be telepathically shown a picture of a naked female acquaintance to facilitate the sperm extraction. I asked Jacobs what percentage of abductees haven't got laid in a very long time. But he doubts it. Who knows, maybe he's right.