This will cause problem...inbalance in sexual appetite.

Some couples are well-matched in the sexual desire department. Others are not.
Most of us are sometimes on equal footing with our partners regarding sexual appetite, and sometimes not.

Low sexual desire isn't a problem, unless one partner has a higher level.
Then it really is the discrepancy that is causing the problem, not the low desire.

And despite the old myth that women are inclined to say, "Not tonight, honey, I have a headache,"
the truth is that in about 45% of relationships with a desire discrepancy, it is the man who has the migraine.
( not me...I am always ready to rock & roll with my honey any time, even now - thinking of her makes my cock stand. She is a truly nasty firm-butt fucker )

It's important not to confuse love with sexual desire.
Many people feel that if their partner loved them (as much as they love their partner),
they would also desire them as much. And it's just not true.

For most of us, our desire fluctuates over time dependent on daily stresses as well as place in the life cycle (adolescence through old age).
But for some of us, low sexual desire can be a function of a physiological problem or relationship issue. Like the one between hubby and wife over any of the following : finanical different, children issue, work-related stress or in-law issue. But at the end of the day, there is a problem that caused this sexual disfunction.
As we live in this modern time....the stress we faced in our daily life often make things worst for our sexual relationship.
Still there are some with a huge appetite for kinky sex...unless they are matched with another of the same appetite than there is a likelyhood of straying. And this does not need to be the 7-yrs itch thing....more like 7-days or 7-months thing for this type of person ( the so-called "born to fuck" type ).