Males are expected to endure substantial injury without recourse. Females, by contrast, are expected to be protected, pampered and coddled. This cultural norm reflects the historical religious view of females as valuable property and the source of pleasure in a cultural system dominated by the often savage competition between males. There is no question that, in a very few instances, females are killed as part of a sexual crime. Most of these tragic murders are really the result of the inhumane punishments imposed upon male offenders.
Some men kill their victims in order to protect themselves.
The punishment for rape is essentially the same as for murder. Having nothing to lose, the man kills the victim to prevent her from appearing against him. The injury done to children by sexual molestation is trivial. There is nothing injurious to sexuality. It's good and pleasant, not an evil.