Sluts in aikido
I believe this type of behavior to be quite common.
My husband has been training for some time, and over the years I have met a certain kind of woman who enters the art for the sole purpose of "finding a man". After all, the art is dominated by men. These women know the practice involves body contact and often use that as an opportunity to flirt.
I know of several instances where affairs have resulted, at least three in Aikido of Marin that involved married men.
I think it should be up to the sensei to set an appropriate moral tone and not tolerate this.