A Harvard-educated Texas Democratic lawmaker drew double-takes for declaring at a hearing that there are six sexes, prompting a rebuke from skeptics who said his count was off by four. Texas state Rep. James Talarico made his pronouncement prior to public testimony Tuesday before the Public Education Committee on House Bill 4042, a measure to bar transgender athletes from girls’ K-12 scholastic sports. Mr. Talarico, a former English teacher, first quizzed Republican state Rep. Cole Hefner, the bill’s sponsor, on how many sexes there are. Mr. Hefner said there were two. “The bill seems to think there are two,” said...