Wiktionary
piquerism
n. Sexual interest in penetrating another person's skin.
Wikipedia
Piquerism
Piquerism or picquerism (from the French piquer - "to prick") is sexual interest in penetrating the skin of another person, sometimes seriously enough to cause death. Piquerism is a paraphilia. The most frequently targeted areas of the body are the breasts, buttocks, or groin.
Usage examples of "piquerism".
You would not associate shootings with piquerism unless you thought about it for a moment.