To talk about something like prostitution, the other person then becomes the wild card that will have a response, and it may not be the response you want. Sometimes I think saying it would be selfish to tell them is still being under the illusion that you have all the power. You say it would be selfish to tell them, when in fact you're scared that in telling them, it gives them the power to do what they might want to do because once they know, they become somebody who could be reactive.