You're the boss, if they don't do as directed they are shown the door. Any shooter who lets models direct what does and doesn't happen on his shoots is an idiot.
Model - I don't do this.
Shooter - My customers don't buy it without that. So it looks like we call it a day. Sorry. Better luck on your next shoot.
Model - OK (or) CYA.
The day models dictate what the shoot will be, is the day customers start thinking it's time not to pay. Whoops that day has been and gone.
Excluding certain types of scenes. The reason models need to kiss, and I've seen loads of lesbian scenes where they didn't, is to build the relationship between the models. So that when they actually fuck there's some passion going on.
So many porn scenes today look like two strangers thrown together and no chemistry at all between them. In reality that's what it is, so we professionals have to work around that and get them into each other on a more intimate nature.
I used to get them kissing passionately and deleted half the pics or video. So that the fucking was just that little bit more real. But what the fuck do I know. I was never clever enough to work shooting $300 solo girl sets for ATK.
Brian you really do need to read my book.
Of course if you're half the shooter you think you are, let me see some of your work. Others have done it, all you do is spout and don't back it up.