Then take them on in court. You know very well this is not a sexual practice so you can lose that point of attack. If you want to legislate against it on the basis of cruelty be my guest. It like prostitution will disappear by making it illegal, right?
What do you mean "lose that point of attack"? This is criminal sexual conduct and a felony under NY state law, whether or not the involved rabbis are doing it for sexual stimulation. This is a Class B felony, subject to up to 25 years in prison under the New York Penal (no pun intended!) Code. Specifically, we are talking about N.Y. Code § 130.50:
Criminal sexual act in the first degree.
A person is guilty of criminal sexual act in the first degree when he or she engages in oral sexual conduct or anal sexual conduct with another person:
1. By forcible compulsion; or
2. Who is incapable of consent by reason of being physically helpless; or
3. Who is less than eleven years old; or
4. Who is less than thirteen years old and the actor is eighteen years old or more.
Criminal sexual act in the first degree is a class B felony.
"Oral sexual conduct" is defined in N.Y. Code § 130.00(2)(a):
"Oral sexual conduct" means conduct between persons consisting of contact between the mouth and the penis, the mouth and the anus, or the mouth and the vulva or vagina.
I would absolutely "take them on in court," by prosecuting them and sending them to prison. We do not, as a society, have to tolerate old men putting babies' penises in their mouths for any reason, and we should not tolerate any such thing.
The idea that this is analogous to prostitution is ridiculous. Prostitution involving adults is a crime but you can make an argument that it's a victimless crime. Prostitution involving children is a crime against the children involved, and I believe it should be actively prosecuted, just as this should be. I find your effort to equate this conduct to prostitution really offensive.