To me, good sex in a relationship is important as hell. Sex in itself is intimacy when you’re at your most exposed, your most vulnerable, and to have those moments really strengthens your trust in your partner (at least I believe). e.g. if you’re turned-on by your partner and through sex it’s confirmed that they’re turned-on by you, is that not a huge bond?
I feel like adding a sexual connection to a relationship only tightens the bond between people, and personally when I have sex with someone I want to feel as close to them as possible. To the point where i’d describe it on a level where I want my “soul”, my essence or whatever the fuck, to connect with theirs.
If that makes any sense.