Does sex have importance, other than pleasure?

Okay, you all! This question is for my blog. Personally, I feel like sex is very important for an emotional connection, not just pleasure. And if able to (like those without sickness, disability, pregnancy sex pains, etc.), is it important to have sex? I feel sometimes couples that are physically able to put it on the back burner with things like, "Oh, not enough time," or "Eh, not tonight, hun" (over & over again), etc. Do you all feel like a lack of sex for physically able couples can be harmful? Like putting off a different kind of emotional support & connection?

***Note: This isn't personally tied to my marriage at all. I'm making a post for marriage advice.*

***Also, I'm not meaning for the occasional skipping of sex, but skipping so much, the fire for it starts to dwindle. Sex is NOT the only form of connection, I know. This is not a out of my personal business question. This is for a blog.*