If it's a choice between the two, if I don't get STDs or have to raise someone else's kids I'd much rather my wife cheat on me than become ugly.  Granted, cheating women are emotionally distant and will act bitchy to and refuse sex with their husband (see: Jack Hyles's affair with Victor Nischik's wife).  Likewise, ugly women are unfuckable.  And cheaters will be mean to you while parasiting off your money, but so will sedentary hamplanets.  So the only additional evil of a cheater, given the two preconditions above, is a vastly elevated chance of divorce-raping her husband's finances.  With a ham non-cheater you get all the vices of a human-sized cheater plus the psychological burden of having to look at an ugly wife. But in this case it's not an either/or question.  You get a Jabba-creature who cucks you.  Better hope to God that, despite her stupidity and high time-preference, she used birth control so you don't have to raise another man's worthless shitspawn.