Do you have a problem with warning for discussion of genitalia in general? I understand why it seems comedic, but I don't think someone who finds the discussion of it in general upsetting is gonna feel that distinction. And that has nothing to do with being an adult or not.
It's realllly not very "out there" in terms of things you would content warn for.
On a mature podcast there is absolutely no earthly reason to have a content warning for the mention of genitalia. Particularly on one that regularly goes there like Waypoint. It's the sort of thing that should be in the show listing page if anywhere.
I don't like using the word, but if someone really is that precious that they need a warning for the mention of horse balls, they shouldn't be listening to any of this podcast to begin with.
It was unintended comedy, and a good example of how Waypoint's best intentions can lead to some of its worst inclinations.