That wasn't a Texas politician. IIRC, it was Bobby Knight, the basketball coach.
he may have said it to but so did Clayton Williams:
During the 1990 Texas gubernatorial race, Republican contender (against the late Ann Richards) Clayton Williams (for whom I grudgingly voted) cause a big stir by quipping to reporters about rain, “It's a lot like rape. As long as it's inevitable, you might as well lie back and enjoy it.”