What if you hook up with a girl and after you have sex she says give me 5 grand or I will call the cops and say you rape me would you pay, I know a crazy bitch that use to do that and she would target married men and they would happily pay up to avoid the scandal.
cheating is too stressful, IMO, in addition to the broken trust and all that comes with it.
but the successful cheats are the one where BOTH people have too much to lose, and BOTH people aren't crazy. If one is crazy, or one has nothing to lose, then all it takes is 4 minutes of a Lifetime movie to set them off. Suddenly they're at your door screaming about some shit or leaving gifts for your kids with their name signed.
Don't cheat. Don't marry a crazy person, don't marry until you're 30 and ready. If you do decide it ain't working, try a separation. If still sure, then you get divorced and you take good care of her - don't screw her over. Also, be sure you have leverage over her so she cannot screw you over. Give her 51% just to let her have that "win". Be respectful. But at the same time, make sure she fears you a bit. Not in the "I'll leave you in the glades in a hefty bar or 3" kinda threat, but in the "maybe I should mention to your govt job that you're self medicating with pot" or something like that. Know where her bodies are buried, and downplay yours, and always make sure she knows from the get-go that you aren't one to be screwed over when all is said and done. At the same time, if it ends, you let her know she is an awesome catch but it's not right for you. If you end it with "your sister is hotter and your vag is smelly", you will be regretting that for the next 10 years of headache.
Be smart, don't be greedy, be honest, protect yourself, avoid the crazies.