Here’s a list of national and state hotlines that aid victims of sexual assault and/or domestic violence:

National Domestic Violence Hotline: 1.800.799.7233 or 1.800.787.3224 (TTY)
National Sexual Assault Hotline: 1.800.656.4673
National Sexual Assault Online Hotline: here

List of sexual assault resources by state
List of domestic violence resources by state

Don’t threaten to rape people in a joking manner. Don’t threaten to rape people, ever.