Your personal life? Your employer probably has to know your marital status, name of "spouse", kids, address and on it goes. Why? because he has to report to Revenue Canada who needs to know too. Even smoking is an issue. And so if you do dumb things and post them expect to be noted for it. Yes and if you think you can be too "free" there are such things as moral turpitude:
Crimes Involving Moral Turpitude The term “crimes involving moral turpitude” (CIMTs) refers to a large category of offences which are considered to be contrary to community standards or community morals. Though there is no definitive list of CIMTs, decades of immigration cases have led to the evolution of a non-exhaustive list of crimes which are always considered CIMTs. Some examples are fraud, arson, blackmail, burglary, embezzlement, theft, counterfeiting, perjury, kidnapping, manslaughter, murder, prostitution, and rape. Simple assault or assault with a weapon are not CIMTs. However, assault with intent to kill, rape, commit a robbery, or cause serious bodily harm is a CIMT as is assault with a dangerous weapon.
So yes, a history of prostitution would definitely put a person off limits in many companies. And participating with a prostitute could render the same result. It doesn't have to be a criminal offence, companies have the right to fire employees who embarass them with a moral issue. Like who wants a former prostitute or pimp as a boss? Would you trust them with the company funds?
Well, I do know a few very trustful SP's, who I respect, but the is not the overall public view.