No, unfortunately we are not talking about the same thing. The example you gave is not an example of mental force. But what follows immediately after that example is a very excellent example of it. This sentence : "If you leave a relationship any time an issue like this comes up, you won't be in any long term relationship." This is the mental force I was talking about. Because in all my of previous comments, I clearly talked about a lack of sexual compatibility, and "any time an issue like this comes up" is not under the definition of it. It's a long term issue, mostly unsolvable. You don't hold the partner back there, you understand your incompatibility and let them go, guilt-free.