The man is described as a white male in his late 20s, 5 feet 10 inches to 6 feet tall, weighing about 200 pounds. He drives a newer 4-door grey or light blue compact car.
"I've been here 20 years and I haven't seen anything that's been constant like this over the years," said El Segundo Police Lt. Brian Evanski.
El Segundo police said in the most recent incident the suspect drove into an alley just west of Lomeda Boulevard and waited until some adolescent girls walked by on the sidewalk. He then dropped his shorts and committed lewd acts in front of them.
The details are the nearly the same in all seven cases. The first incident occurred in an ally just north of the 800 block of Grand Avenue. He then struck twice in an ally east of the 400 block of Standard Street, near a park and only a block from the police station.
Investigators say the suspect hasn't been violent, but they're worried about the pattern.
"We always have that in the back of our minds, again we've been fortunate that it has not happened but you know there's certainly a possibility," said Evanski.
El Segundo has very little crime, so the flasher has unsettled many residents.
"I'm concerned. You know, I've been living in this town for 30 years and this is the first I've heard of it and I'm really concerned about it," said resident Mario Cetina.
Anyone with information was urged to call Evanski at (310) 524-2260.