This is something new for me and I can say its pretty interesting... From my own example I can say I lack water in my chart except for 2 generational planters in Scorpio (my sun and moon are in water houses though, not sure if it makes me any watery 🙂 ). I always feel attraction towards water signs, and my friends mostly being cancers and couple of Pisces.
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I have one Grand Trine in water (my only 3 Planets in water, Sun Mutable, Mars Cardinal, Uranus Fixed) to her.
She has Cardinal Earth Sun and Mercury (the only earth planets she has) to me.
Group Things, see what gives for your relationship. Attraction exists?