Indeed
Penis envy is not a natural strain and cannot grow in the wild, they were specifically bred by humans over hundreds or thousands of generations/breeding. I think the story goes all the way back to the McKenna brothers, but I'm not sure how true that is.
Penis envy are also more difficult to grow for this reason.
Out of about 15oz of Penis envy that I grew, only ONE shroom had an open cap to spread spores that could be printed, most of the caps never open at all, which is why they looks like schlongs lol. They're mutants and not supposed to live. This is why they don't grow in the wild.