Since whatever you did.. she keep saying it's dirty. Try doing it at the bathroom.. washing can be done immediately.
Teach her the joy of dirty sxx. U have to put in more creativity to spice her up.. to make her be naughty... else you forever get a "doll" on the bed only.

Hey guys, putting romantic mood.. or watever won't work if she is lazy. She is not those kind tat worry bout sxx b4 marriage.. as she already surrender it to TS some time ago.
Some woman may think that sxx is just part of the responsibility to keep their partner with them. They may not understand that it takes 2 to tango.

TS, mayb u try a strategy... u freeze her for some time.. I mean don't touch her .. put no interest to sxx her. Even she demand, you reject. Until she ask you why.. u tell her "watever also dirty.. u feel bored."
Also hint her "each time also like tat.. not interested anymore."
See if she worry.. if she loves you.. she should worry and try to do something to make you interested on her again. If she still not interested.. then you have to get ready.. she will forever be like tat until she old. Good luck.