When Texas state Senator Angela Paxton announced Thursday on social media that she had filed for divorce from her husband, state Attorney General Ken Paxton, on “biblical grounds,” observers immediately began asking: What? The Paxtons have long cited Christian scripture in the face of adversity—tough elections, media reports of gross corruption—but the term quickly became a meme, with Twitter comedians (read: politicos and journalists) testing out new material.So what is “biblical grounds” for divorce? The short answer is: cheating. That’s according to a fairly narrow interpretation of New Testament passages on divorce, believed to have been written back in 90 or so AD, before such proceedings could be initiated by women. “I say to you that anyone who divorces his wife, except on the ground…