Over the course of a week in March last year, three women told police they were shopping in a Dollar Tree store when a stranger neared and apparently either ejaculated on them or wiped semen on them from behind. The incidents have spurred criminal charges for a locally-based U.S. Marine and a lawsuit in San Diego Superior Court targeting the store chain. That suit contends the women weren’t targeted as a random lewd act, but part of a wider phen…