Most likely it's deception, trying to find a loophole in the law for freedom of religion and combining it with sex. Sex sells, religion is important to people. Combine them, charge = more money. That's the vibe that comes to me.
pros·ti·tu·tion   /ˌprɒstɪˈtuʃən, -ˈtyu-/
noun
1.
the act or practice of engaging in sexual intercourse for money.
Dictionary.Com
Yup, probably that.
Vāmācāra (Left Hand Path) Tantra accepts the pancha makara (five m's: meat, alcohol, fish, parched cereals, and sex) - but they are put under strict ritual usage. Neo-Tantra is a Western ******** term for casual, spiritual-like sex and trying to make it seem authentic by taking it from the East whilst perverting its core doctrinal beliefs, it's as simple as that.
Either way, even if we do accept it as something they can do and allow them their corrupted terminology... there's two choices:
Pay for the therapy, and don't have sex with the therapists
Have sex with the therapists, and don't pay
If I pay for a private tutor, I don't expect them to do my homework for me.
My $0.02.