This can happen. I think it would be more likely to happen in medium term relationships where the couple lives apart.
Rollo Tomassi mentioned in this 2011 blog post (which was the basis of a chapter in 2013's "The Rational Male" book) that non-marital co-habitation typically leads to a decrease in sexual availability and desire. It is interesting that your live-in relationships have not followed the pattern described here.
Iron Rule of Tomassi #4 NEVER under any circumstance live with a woman you aren’t married to or are not planning to marry in within 6 months. You are utterly powerless in this situation. NEVE…
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