Time Line

Is there a method for medically determining the last time sexual intercourse occured? I was terminated from employment due to a slanderous accusation of sexual misconduct with an employee in my office on Saturday. I am filing a lawsuit against the accuser and have a feeling that the employer is going to say they don't have access to the camera tapes from my office. Yes, there are security cameras there. I need to know if I can physically prove that I did not have sex with this person at the time alleged?

[Elaine Brown, MD]

Hi!
It is possible to detect semen traces in the vagina/ cervix for up to 3 days after intercourse.  DNA analysis can be done to determine whose semen it is.  When there is an allegation of sexual assault, the victim can choose to be subjected to an exam with collection of evidence.  This then follows a chain of evidence procedure so that the evidence can be used in court.  A negative finding does NOT prove that intercourse did not take place however, because many factors could cause a false negative exam.
Unfortunately, I don't think that there is anyway to prove that intercourse did NOT occur, unless you have a witness who can provide an alibi.
You will need to hire a good attorney who is experienced in sexual assault cases.
Good luck!
Dr B