An elderly man “dropped his trousers” and exposed himself to a woman in a Sleaford graveyard.
The man was described as being around 70 with a grey beard.
A woman was walking her dog through a churchyard on Church Street, Ruskington when she saw the man.
The flasher was wearing a short black jacket and jeans at the time.
It was reported to police at around 4:48pm on Sunday, November 11.
Lincolnshire Police are investigating the incident and are urging anyone with information to call them on 101, quoting incident 281 of November 11.