Sex & Love ....
I use to think those things correlated ... but ...

If sexual intercourse is the only time or way you guys can experience a non-physical euphoric mess together .... it will burn owt quick

so yea, with that said, it's very good to wait until you at least see elements of that person that align with you organically.
If you want something real that will last. You gotta find a deeper spiritual bond with somebody outside of what their body can do for you, or what your body can do for them.
When that happens, the intercourse is really so much better.
But in the same way good sex can't predict a relationship being good or lasting, sex on the first night won't determine those things either. It all depends on a person's mindset and how mature they are.