You COULD argue that it was indecent exposure if he could be seen from the public sidewalk. If he could only be seen from his yard, and the woman was trespassing on his property, then I don’t see how they can possibly make a case.
So, I guess it depends if the window faces the yard and if there isn’t a complete screen of bushes or a fence. Otherwise, the police may twist things to favor this nitwit woman.
If I were he, I would put up a fence and some no trespassing signs, since otherwise I suppose people can say that they have a right to walk through—since we are talking legal technicalities and not common neighborly politeness.
OK, I just watched the news report, and as a healthy heterosexual female, I shall have to say....
NOT GUILTY! LOL
I would expect that the case would be dismissed with a warning to both the man and the woman trespasser.