Sexual Assault and Consent Under Missouri and Kansas Law

In a civil sexual assault lawsuit, a defendant who successfully argues that the victim consented may avoid liability entirely. Being prepared to counter this defense is one of the most important parts of your case. Both Missouri and Kansas define consent differently, and those distinctions can shape how your claim unfolds.

What Is the Legal Definition of Consent?

What constitutes consent is a matter of law in both states, and the two approaches differ in important ways.

Missouri defines consent as words or overt actions indicating a freely given agreement to have sexual intercourse or sexual contact. Under RSMo Chapter 566, a current or previous relationship between the parties does not, by itself, constitute consent, and a lack of physical resistance does not constitute consent either.

Kansas does not provide an affirmative definition of consent by statute. Instead, K.S.A. § 21-5503 defines the conditions under which a person cannot consent.

This can include when a victim is overcome by force or fear, when the victim is unconscious or physically powerless, or when the victim is incapable of consenting due to a mental condition, disease, or the influence of drugs or alcohol.

The facts and circumstances of your individual situation will determine whether consent was given. There may also be factual questions about what the assailant perceived at the time.

The civil standard for consent can differ from the criminal standard, meaning conduct that did not result in a criminal conviction may still support a civil claim for damages.

How Does Consent Affect Your Sexual Assault Lawsuit?

If the defendant claims you consented, it can weaken your case. To receive compensation, you need to show that the sexual contact was unwanted or unlawful. Defendants typically push back on this in a few ways:

• Denying your version of events entirely, claiming the contact was voluntary
• Admitting sexual contact occurred, but arguing you gave verbal or implied consent 
• Claiming consent can be inferred from the circumstances, such as a prior relationship 
• Challenging your credibility, which could require you to testify about painful memories under cross-examination

How to Overcome a Consent Defense

If the defendant argues you gave consent, you must present evidence that overcomes that defense. The following arguments may apply to your situation:

• You withdrew consent at some point during the incident
• The defendant exceeded the scope of any consent you may have given
• Physical evidence is consistent with signs of a struggle
• The defendant obtained consent through fraud or misrepresentation
• You were incapacitated and could not have validly consented
• The defendant has given conflicting accounts of what happened

Overcoming this defense often means presenting a combination of witness testimony and physical evidence. One important point to keep in mind: you do not need to meet the same standard of proof as a criminal prosecutor. In a civil case, you must show that your version of events is more likely than not to be true, not prove it beyond a reasonable doubt.

What Evidence Can Be Used to Prove Lack of Consent

Many survivors worry that without physical evidence, their case cannot succeed. That is not true. Civil sexual assault claims are won on a range of evidence, and no single type is required.

Records of communications before or after the incident, patterns of behavior by the defendant, documentation of medical or psychological treatment, and your own detailed account all carry weight in a civil case.

Expert witnesses can also help explain to a jury why survivors respond the way they do, countering assumptions about how a victim “should” have reacted.

Physical evidence can support your claim, but it is never the whole story and is never required. What matters most is building a complete picture of what happened, and that is exactly what an experienced attorney will work to do alongside you.

Talk to Our Kansas City Sexual Assault Attorneys For Answers

If someone has raised or is expected to raise a consent defense in your civil sexual assault claim, having a legal team that knows how to confront that argument directly can make a meaningful difference in what you recover. 

Our attorneys at Wendt Law Firm represent survivors of sexual assault in civil claims across Kansas and Missouri. Every case is handled with discretion, and we work to make the process as straightforward as possible for you.

Consultations are free and confidential. Call our Kansas City team at (816) 531-4415 or reach out online to discuss your options.