Good point about the honesty physics girl phd. There is a guy I have known now for about 35 years. His business requires him to travel, and I found out about 10 years ago that when he would come to Maine, he would tell his wife (a sweet, intelligent woman) that he was staying with me and my wife, when actually we often wouldn't see him at all because he was having an affair with a local woman (or two). When his lies started unraveling, his (now-former) wife thought that I was complicit in his lies and it really ticked me off. He has not been welcome in my home since I became aware of his double-dealing. Even now, his ex-wife doesn't call, though she and I had been friends since the time that he met her.
If you can't keep the most simple basic promise to your spouse or partner, you have a character flaw that is pretty damning. If you implicate friends and acquaintances in your lies and damage reputations and mutual friendships in the process, you are scum. I can't be bothered to wonder who is straight or gay or who is in an "open" marriage or who is having affairs. What really grates is the holier-than-thou people with political or religious authority that act all contrite when they are caught, saying "I let down my friends and family, and I hope my God can forgive me". I would be more sympathetic if they apologized to gay people, drug-addicts or adulterers that they had demonized before their own demons were exposed.
An old friend (he's long dead now) was a non-religious farmer/woodcutter/brick-mason (all in season), and he used to tell me "A liar will steal and I hate a thief." My wife and I were renting an old farmhouse in the area, and he and his wife gave us a couple of acres of land to try to keep us in the area, after I spent all my spare time one summer helping his youngest son build himself and his new wife a stone house. Jealousy from other family members made that neighborhood untenable, so we sold the place to one of his grandsons. We still remained very close to him, his wife, and his youngest son. I often think back to my friend and his back-woods definition of ethics, and I can't help but think how much better the world would be running on those standards.