|Respect the chemistry, yo|
And yet you have to respect the chemistry. Even these stories are artful in their own way. They operate on different rules from mainstream fiction, but the basic principles are still much the same, at least for me.
The basic idea here is that these stories are still stories. The base version of these has a pretty simple formula: dude gets turned into a chick through some means, has a few moments of awkward adjustment, gets fucked (most often consensually), and that's it. Because the getting fucked is so awesome that he wants to be a chick forever! I'm not sure any women reading this would agree with that assessment.
As a big fan of the old Twilight Zone, my favorite way of doing these is the Rod Serling-style comeuppance. Like in the first story of Transformed Into a Schoolgirl, a guy murders a teenage girl, gets shot by the cops, and then finds that through some Victor von Frankenstein science his brain is now in the body of the girl he shot! Or in Transformed Into a Whore, a modern Jack the Ripper is captured by a bunch of prostitutes and turned into one of them! Or in Transformed Into a Geek Girl, a football jock is turned into a geeky girl who lives with the nerds he tormented. Sometimes I like to get a little political, like in Transformed Into a MILF when a Rush Limbaugh-style shock jock becomes a 50s housewife to realize it wasn't so awesome. And of course the Transformed for Christmas was a whole riff on A Christmas Carol, where a jerk got his comeuppance.
The other most popular way I have to do these is accidental change. Basically some poor schmuck drinks something he shouldn't or takes a wrong turn to run afoul of a witch or something and ends up as a girl, who may or may not find out that it's awesome. Like in Transformed Into a Bimbo, a scientist's lab is broken into and he ends up getting doused with the wrong chemicals that eventually turn him into a bimbo. Or in Transformed Into a Cougar where a kid makes a wish on a comet and finds himself turned into his hot female teacher. Is there really a message to those? Not so much, though some turn more into love stories than erotica.
Anyway, the point I'm making is that even a genre that might seem inferior or scummy has its own internal logic. It has its own chemistry that you should respect.