Yes, they must unequivocally call an attorney. Even if they are put on the spot, they have every right to have an attorney present. So many sex crimes are being investigated purely on allegations made by an alleged victim. Therefore, consenting to an interview where you are making statements or not really sure what you are being accused of or locking yourself into a factual explanation of things that you have not had time to think about, discuss or look back into can be fatal to your case going forward. It is always good to consult with an attorney and decide even if you are going to cooperate and then if you are, to have someone there to mediate that conversation.