Regarding enthusiasm, I'm reminded of a fellow that I spoke to after he had left a local "swinging club", which was the source of endless speculation among my associates and me.
I asked this 30ish, obese dude what he had been doing in the swingers club.
He said, "Oh you know, just drink, watch dirty movies, relax and have sex and stuff."
I asked him what the women were like in there.
He answered, "Oh, theres all different kinds, they're friendly. You can ask them if they want to have sex, but if they say no, you have to leave them alone."
"Oh. Did you have sex with a woman in there?"
"Yeah, I did."
"Was she there alone?"
"No. Her husband brought her."
"Where was he when you were having sex with his wife?"
"Well, he was right there."
"That didn't make him mad?"
"Oh no, he encouraged us."
"Do you mean that some other guys were having sex with her too, while her husband watched?"
"Yeah."
"Did she like it?" (read, was she enthusiastic?)
"I think so, her husband said she liked it."
"What do you mean?"
"Well, she was crippled."
"Huh?" "She was crippled?"
"Yeah. She was in a wheelchair."
"But she couldn't talk?"
"Well, she was like retarted, too."
"And you guys all had sex with her in front of her husband?"
"Well, yeah."
"How do you know that she wanted to have sex with you guys?"
"Well, her husband said she liked it. He could tell. Plus, she was making noises too, kind of grunting, so ..."
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Because I wondered how "enthusiastic" the female was, the matter was investigated. It was determined that no crime was committed.
End of story. This place is still in business today.