My wife's new game is being nude when the window cleaning is doing our windows

My wife's new game is being naked when the window cleaning is doing our windows, should she encourage him to touch her?

Depends on whether you are comfortable(perhaps turned on?) by the thought of seeing someone else touching your naked wife. If the window cleaner is receptive to it, he may also want to take it further. Are you comfortable with that?

I love watching men grope my wife and would love to watch her suck his cock and be fucked by him

Wouldn't you also secretly love her to watch you being groped by this window cleaner guy and your wife directing you to suck his cock and be fucked by him?

Have Windex and squeegee, will travel.