Your H doesn't respect you. He doesn't respect the OW. Maybe he doesn't respect women in general, IDK. If he has sex issues, then he needs to see IC for that.
I personally do not think a W should have sex with her H just trying to keep him from getting it from OW. He clearly has shown you that that is not going to stop him.
Doesn't it make you feel degraded by the way he treats you? What kind of role model does for M does this teach your D? Are you doing what you would tell her if she was in this stitch? Do you want her to M a man like her father?
If what you have been doing is not working.....don't you think you need to change something?
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!