Monica Lewinsky made a poor choice when she had sex with a married man.

[Xipe Totec]

7. You should really do your own research. But since you asked.

Physical evidence conclusively establishes that the President and Ms. Lewinsky had a sexual relationship. After reaching an immunity and cooperation agreement with the Office of the Independent Counsel on July 28, 1998, Ms. Lewinsky turned over a navy blue dress that she said she had worn during a sexual encounter with the President on February 28, 1997. According to Ms. Lewinsky, she noticed stains on the garment the next time she took it from her closet. From their location, she surmised that the stains were the President's semen.(1)

Initial tests revealed that the stains are in fact semen.(2) Based on that result, the OIC asked the President for a blood sample.(3) After requesting and being given assurances that the OIC had an evidentiary basis for making the request, the President agreed.(4) In the White House Map Room on August 3, 1998, the White House Physician drew a vial of blood from the President in the presence of an FBI agent and an OIC attorney.(5) By conducting the two standard DNA comparison tests, the FBI Laboratory concluded that the President was the source of the DNA obtained from the dress.(6) According to the more sensitive RFLP test, the genetic markers on the semen, which match the President's DNA, are characteristic of one out of 7.87 trillion Caucasians.(7)

http://www.washingtonpost.com/wp-srv/politics/special/clinton/icreport/6narrit.htm#L28

Try to come better prepared next time.