Keeping sexual communication open throughout your relationship is critical. As one partner starts closing off, and not just having periods of low sexual desire, but shutting down the idea of sex, something is going to break down.
If you meet a partner who is lacking in their ability to communicate, commit, and renew their intentions, you might want to continue along your path in search of a different partner.
Connected sex is what I'm after and what drives my fulfilling feelings. I get closeness from sex. I get relaxation and bonding from sex. And with my wiring (my Love Language is touch) sex or "skin time" is important. But skin time can be cuddling. Or hugging and kissing on the couch.