True statements regarding rape, incest, and abuse include which of the following?

Sexual assault happens to people of all ages. The mentally and physically handicapped and the very old are particularly susceptible. Victims of rape should always be treated as victims and at no time should the implication of guilt be applied to them. Psychological reaction to rape includes two phases: an immediate phase of paralysis of the coping mechanisms, usually lasting hours or days, followed by a more prolonged period of reorganization that may last months to years. The victim's menstrual history, birth control regimen, and known pregnancy status should be assessed at the initial examination. In the experience of most sexual assault centers, the chance that pregnancy will occur as a result of sexual assault is quite small and has been estimated to be approximately 2 to 4% for victims having a single unprotected coitus. If the patient has been exposed at midcycle, the risk would obviously be higher. "Morning-after" prophylaxis using high-dose estrogens or oral contraceptives should be offered to unprotected rape victims. About 10% of all physically abused children are also sexually abused. Although the crime is underreported, it is estimated that about 336,000 children are sexually abused each year in the United States. Incestual activity may be experienced by as many as 15 to 25% of women and 12% of men. A family member is the sexual abuser of a child in about 80% of cases. Father-daughter incest accounts for about 75% of reported cases. A brother-sister relationship may be the most common type of incest but is reported less frequently.