The genitals appeared to be missing because they were buried, but the prof likely didn't know enough about circusfats at the time to be able to know where they'd gone. I'm sure we all remember our first instance of a FPH picture of "buried penis," and the resultant confusion in our brain. Chewed-off peen would look like chewed-off peen, not look "just gone." Buried penis looks "just gone." Ahhh, the naive days of pre-1995, when circusfats were still rare enough that even a doctor might not be familiar with buried penis.