There are some great answers in this forum! If the sex completely stopped happening, I'd have to question "why?". I'd re-evaluate the relationship and then make a determination...fight to save it, or end it!!! Cheating IS NOT an option in my book!!!

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I wish all the ladies were pies on the shelf...and I was the baker because I'd eat them all myself.
I wish all the ladies were potholes in the road...and I was a dumptruck because I'd fill them with my load.