Was bedeutet have you ever been paid for sex? ?

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@sj903 Yes, the passive is caused by the past tense form but also by the word 'been.'
The passive is a combination of:
1. a form of 'be' that is appropriate for the sentence structure. (tense, agreement, etc.)
2. the past participle of another verb (usually the same as the past tense form, like "paid" here.)

But the 'have you ever' structure also requires a verb in past participle form, because it is a special case of the perfect form, which uses "have." So we have active voice:
"Have you ever paid money for sex?" - "paid" is past participle because of "have." This is about paying money.
Vs. passive voice:
"Have you ever been paid money for sex?" - "been" is past participle because of "have." "paid" is past participle because of "been." This is about getting money.

As you can see, the form of each verb depends on the previous verb in the verb phrase. I hope that makes sense.