Like someone sneezed?....

Well, it might be like that for you if you are the one doing the cheating, but for the woman involved, and I strongly suspect you are a man, it doesn't always have such an inconsequential effect. Geeez!

Disrespectful?  You mean like yawning when someone's speaking? I also disagree with your assessment of "low level violation of trust".   I might call using someone else's toothbrush a low level violation of trust, but not one's partner using someone else.

I do somewhat agree with you; 'once a cheater, most likely always a cheater".

Looking back at your post, I feel a sneeze coming on.........aaaahch....!

LOL