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Rebecca Odorisio was traveling home on a crowded A train on Tuesday when a photo suddenly appeared on her phone from someone identifying himself as “The Enterprise.”

It was a picture of an erect penis, sent to her over AirDrop, an iPhone feature that allows users to send photos and documents to anyone within 30 feet who has left that feature open. Disgusted, she quickly rejected it.

“I felt like I had been punched in the gut,” Ms. Odorisio, 31, a Brooklyn-based actress and singer, said Wednesday. She said it was not the first time something like that had happened to her, adding, “It was extremely violating.”

Kathe Hannauer, 58, had a similar experience last month, as she traveled from Brooklyn to Manhattan on a crowded train during the evening rush.