Aggravated Sexual Abuse: Crossing a State Line with the Intent to Engage in a Sexual Act with Child Under 12 is a federal offense that is considered one of the most serious sex crimes. This crime involves a person crossing state lines with the intent to engage in any type of sexual act with a child under the age of 12. This type of aggravated sexual abuse carries a penalty of up to 30 years in prison, as well as fines and possible life-long sex offender registration. Types of Aggravated Sexual Abuse: Crossing a State Line with the Intent to Engage in a Sexual Act with Child Under 12 include enticing a minor to cross state lines for a sexual purpose, transporting a minor across state lines for a sexual purpose, and coercing a minor to cross state lines for a sexual purpose.