The following is an excerpt from the Colorado State bar that explains the sexual assault law that Kobe Bryant is charged with breaking:

18-3-402. Sexual assault in the first degree.
Any actor who knowingly inflicts sexual intrusion or sexual penetration on a victim commits a sexual assault in the first degree if:
(a) The actor causes submission of the victim through the actual application of physical force or physical violence; or
(b) The actor causes submission of the victim by threat of imminent death, serious bodily injury, extreme pain, or kidnapping, to be inflicted on anyone, and the victim believes that the actor has the present ability to execute these threats; or
(c) The actor causes submission of the victim by threatening to retaliate in the future against the victim, or any other person, and victim reasonably believes the actor will execute this threat. As uses in this paragraph (c), "to retaliate" includes threats of kidnapping, death, serious bodily injury, or extreme pain; or
(d) The actor has substantially impaired the victim's power to appraise or control the victim's conduct by employing, without the victim's consent, any drug, intoxicant, or other means for the purpose of causing submission; or
(e) The victim is physically helpless and the actor knows the victim is physically helpless and the victim has not consented..