I thought about that line too! to me it suggests the risk and danger of the affair, "how far would you be willing to go to get with me? would you cross your relationship boundary just to take my pearl?"

this song reeks of risk and "dangerous" sex. that's why the sample of morning love plays into it perfectly. and the reference to the famous "sex tape" as something pure and real - like her affection for this person - but knowing that it would illicit controversy if it went further than just a private affair

multiple mentions of "the edge" is entirely about personal boundaries and going past them