Are OPKs essential if you’re having enough sex?

Genuinely curious why people would take OPKs every day, when if you’re having enough sex, there should be sperm in your body regardless of when you ovulate?

I’ve had it confirmed by bloods that yes, I do ovulate on my own, so if I just have sex every second day, surely testing becomes irrelevant?

If I am wrong, please jump in and tell me!! Perhaps I don’t understand the process entirely.

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