Spark

What you are talking about is a real phenomenon. This is often described as Kundalini or Love-drunk, etc. It is caused by the "falling-in-love" chemical Phenylethylamine (PEA) which has major effects on dopamine and adrenaline.

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This chemical typically ceases in a mature relationship, beginning to taper off by year 3 and usually disappearing by year 5. This chemical plays a major role in female sexual initiation. Even girls highly attracted to their men, tend to stop or greatly reduce independent sexual initiation after this period. This is why women that seem sexually independent early in a relationship become almost completely sexually responsive after a few years. What this means practically is that female arousal is almost entirely dependent on a reaction to the arousal of others. Whereas a sexually healthy (non-porn-conditioned) male will feel spontaneously aroused by reproductive instinct.

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This phenomenon leads to well-observed shortcomings in lesbian LTR, which typically experience bedroom death after 5 years, and also last an average of 5 years.

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A robust and frequent sex life helps to keep female dopamine levels high, which aids in rapid female arousal. A weak and infrequent sex life makes female arousal much more difficult. The "7-year-itch-phenomenon" is a outworking of PEA. New people are much more exciting than an LTR, because they cause the production of PEA. Suddenly a wife that can't get horny on her own, feels spontaneously horny, due to the new face. Males universally feel more spontaneously horny than usual with a new face, the PEA that follows just intensifies it.

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The truth is that if a confluence of events causes your wife to lower her guard for shirtless Roy and his immense hairy belly, she will likely feel more intensely aroused by him than by you due to the Kundalini chemical.

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According to the well-observed Coolidge Effect, males typically will prefer novel mates every time the opportunity is present in addition to renewed excitement with a novel female. Combine this with PEA and you a recipe to blow up your life after improving your SMV. Suddenly hot girls, decades younger than your wife are touching your arms and giving you IOIs. Sure, you're just flirting for practice, until one day you aren't and there's a beautiful sophisticated 25 year-old Goldilocks you can't stop thinking about, and suddenly boning your newly-compliant wife feels like a chore, because you're pretty sure Blondie's asshole tastes like peach-vanilla cake.

Your hamster will think up what it needs to in order to downgrade the value of the existing female into order to reserve gamete production for the novel female.

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Females respond to this competition by exploiting the limits of reproductive arousal. In other words, they drain your balls, devour your gamete production, and sexually exhaust you in order to keep your dick out of strange. This is dread-responsive sexuality. Maintaining sexual health in an LTR requires several elements, and these elements enable the "spark" to persist well past the presence of PEA in an LTR:

1) Maintain high SMV in contrast to wife  2) Maintain social dominance, mastery, and leadership over wife  3) Maximize your sexual initiation, and sexual frequency  4) Maintain a sufficient level of dread to trigger dread-response sexual interest from wife 

There is a reason MRP is considered hardmode and it is partly due to the absence of PEA, and the cocktail of cascading hormones present in a new sexual encounter/relationship.