No marraige. Because we understand the one-sided benefits that come with signing a state protected contract that, if ends for any reason, will totally destroy the man by dragging him through the family court.
No cohabitation. Because living with a woman causes her to get comfortable and lazy. The mystery is gone and she knows where you are and what you are doing at al times. She can begin the relentless henpecking that wears a man down over time. Suddenly lose her part time job. And above all else, this arrangement also often surreptitiosly provides all the same protections under the law similar to just a regular marraige contract.
No long term relationships. Because relationships have a 'honeymoon' period. After which, she will stop trying to be her best for you. She will allow herself to get fat. Cut off sex. Constantly shit-testing you. However, in spite of all this, her demands increase. She is no longer happy with the dinner date at the steakhouse. Now she wants the dinner at the 4 star up town. When this stage of the relationship comes, we want the ability to say no thanks and go find something better.