Keep in mind that during a criminal case where the victim is testifying on his/her own behalf, neither party has your interests at the core of the case. The prosecution is looking to defend the case and the defense is looking to discredit you. This means the prosecution wants you to look like the most reliable person ever while the defense needs to make you look like you may have mis-remembered the events you described. This is due to the fact that until proven beyond a shadow of a doubt the accused is still innocent. You have to prove to the jury that there was no other way this could have gone down. The defense only has to prove that there could have been another way this happened. The character of the victim does matter as the goal here is to establish they were of proper mind to not consent to being raped. These questions raise in the jury's mind that you were looking to have sex and found some and consented (or, didn't indicate negatively that you did not want this to happen). Sad as it may be, there are cases where the guy and girl do remember the sequence of events differently.
Now that said, the response is situational and no one response will win over your accusation. RAINN offers some helpful hints to what you should and should not do while under oath, but they aren't defenses so much as winning attitudes. A good Prosecutor will know your weaknesses as a witness and will work with you to get out of these situations while still presenting to the jury that you are to be believed over the accused (most lawyers know exactly what a witness is going to say to any given question long before they ask it in court). During Cross, the Defense is limited to only matters that came up during testimony, so there could be ways to avoid the matter based on the prosecutor's questioning... but to paint a picture vividly for the jury, sometimes you need to get into the darker colors. Sometimes, its best for you to "steer into the storm" and confront the questions about your weaknesses directly.
It's also not commonly scene, but there is a phase of questioning where the prosecution will Redirect you and basically ask you to clarify the response on Cross examination (A good lawyer on Cross will only ask Yes or No questions. Redirect will still give you a small chance to clarify statements that might hurt the case. The Defense does get a "ReCross" as well, where he will ask about only things related to Redirect.). These are short, typically boring, and don't count for "Asked And Answered" as they were not asked during the same phase of your testimony.