Legal Male Prostitution in San Francisco

The New York Times reports today on a commune, "One Taste," in San Francisco in which female members are manually stimulated by men:

At 7 a.m. each day, as the rest of America is eating Cheerios or trying to face gridlock without hyperventilating, about a dozen women, naked from the waist down, lie with eyes closed in a velvet-curtained room, while clothed men huddle over them, stroking them in a ritual known as orgasmic meditation

How is this legal? Female members of the commune don't pay directly for the sexual activity, instead they pay for the "course":

She resisted offers to pursue further courses (for a fee), deleting the center’s incessant e-mail messages. But on the cusp of her 29th birthday, she tentatively returned. “I was scared to open up my life that much, but I was more scared not to,” she said.

Now an instructor herself, Ms. Crittenden talks about “the lingering velocity of my desire and my hesitation to give into it.”

In my opinion, California authorities should shut down this commune. They should treat it in the same manner they would a "massage parlor" that offers erotic activities (of course, I have nothing against legitimate massage therapists).