It’s merely coincidental that TCM is showing 1966’s One Million Years B.C. the same time that IFC is showing the 2008 film 10,000 BC, and the same night PBS is premiering First Peoples (9 p.m. ET; check local listings), a documentary about the rise of early Homo sapiens. The real reason TCM is showcasing this movie tonight is because Wednesdays, this June, are devoted to “Pin-Up Girls,” and One Million Years B.C. is one of the early, indelible examples of Raquel Welch’s body of work. If you’re looking for historical or scientific accuracy, don’t bother. But if you’re looking for a prehistoric pin-up, you’ve found her.