MangyInseam
I suppose then you have to ask how far you take that.
Is the person is unaware what's going on, for example.
Not to be too graphic, but I can remember reading those books they have for adolescents at school libraries saying that any kind of sexual fantasy, about the person next door for example, or a film star, etc, was ok, because they wouldn't know about it and it can't affect them.
Not the old sexual conservative view of that would have be to say, first of all, that it was still probably disrespectful to the individual being used for the fantasy (especially someone you know and interact with), and secondly, it can affect the way the person doing it thinks about and relates to others by making them up as private sexual objects.
If this is all ok, then it becomes a lot harder to pinpoint where it all goes astray. Is some guy shopping for eggs who is privately indulging a fantasy of himself as a housewife a problem given no one else in the supermarket can really know that? Or what?
When you start to think about how this could be managed at the level of social norms, it all starts to look a bit different because of course we don't know who is doing what for what reason.
I would think the line should be drawn when those fantasies are taken into a public space, particularly one that is designated for a particular group they are not part of. That's why we have to have a solid 'no men in women's spaces, end of!' It's the only way.
Men who breach women only spaces in service of their fantasy are not victims in need to cosseting, they are co-opting others into their deviancy.
We all have fantasies, some nice, some weird, whatever. When you project those onto other in a very public way, and expect to be pandered to, there's a huge problem. They have now been given permission to take this out in the open, into the mainstream and more importantly, laws are being changed to facilitate this.