A common example of this is when people respond to a story about a rape case where the alleged victim dated and then kissed the alleged rapist and then they use that kiss to claim the accused must not be convicted. The conditional ethics active in this response turn any sexualized interest into a valid substitute for consent.
Some people who hold conditional sexual ethics will try to deny doing so by reframing their conditional ethics in terms of reasonable doubt. If anyone might consent in a certain scenario then they position allowing sexual violence in that scenario as a result of our legal system.
However, this makes as much sense as stating that an agreement to have a relative stay one night must be treated as if it were an agreement to have that relative stay forever no matter what the homeowner wants or says. The fact that some relatives become roommates isn't used to negate all situations where this doesn't happen.
We understand that consent in other areas is not all or nothing, but too many people refuse to understand this when it comes to sex. This must change.