Here, why is the verb “give” in the present form?

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It is conditional tense. It is talking about a hypothetical button that exists in the present. Was and were are the past tense, but with the conditional, they can refer to the present. It is also correct to say, "a button that gave you...", but in conversation, I think "that gives you..." is more common. It is wrong here to mix the two "a button that gives, and made you gay". It should be "gives & makes" or "gave & made". One or the other.
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