The Lopez family is well-known in taekwondo circles. Steven Lopez is a five-time Olympian and three-time medalist. His siblings Mark and Diana are also Olympians, and Jean Lopez has coached all three of them.

Along with dozens of Jane Does, four women are named as plaintiffs in the lawsuit. One of them, Heidi Gilbert, 36, said Jean Lopez became her coach in 2002.

“My Olympic dream was so strong,” she said on Saturday. “I really wanted to go to the Olympics.” She trained with Jean Lopez at the Pan American Taekwondo Championships in Ecuador, where she won a gold medal.

Shortly after that victory, she said, she was in a hotel room with his sister. Then he arrived, and his sister left.

“I thought we were going to talk about my training and furthering my Olympic dreams, and he throws me on the bed,” she said.

The suit said he rubbed himself against her until he ejaculated in his pants. “I just remember being like, ‘Wait, no, that didn’t just happen,’” she said.

Ms. Gilbert said Jean Lopez stayed in contact and seemed to be invested in her success in taekwondo, so she eventually moved to Texas to train with him and other elite athletes. But she described the environment as “dysfunctional” and “almost cultish,” and during another trip abroad — to Germany in 2003 — she said Jean Lopez gave her a drugged drink and sexually assaulted her in a hotel.