I hadn't run into this story today (thank God!). John Hawks' begins a critical post:
I am just about to go crazy today. I just can't seem to escape the "gay caveman" story. No, I don't mean the Geico caveman who likes mango duck breast and who has Talia Shire as his therapist. His sexual orientation I don't know.
In the sitcom, Cavemen, they were all straight. The main issue in regards to sexuality was that one of the cavemen tended to date sapiens sapiens females, and his girlfriend had a tendency to hook up with cavemen. Another of the cavemen frowned up these "mixed" relationships.