They want you to perform stuff only seen in “Fifty Shades”
Intercourse is a very intimate act, so your partner should show you nothing but respect and patience when it comes to your needs in the bedroom.
Naturally, that also includes not coercing or shaming you in any way, nor forcing you to do something that you’re not comfortable with. Also, if you already said no to something your spouse proposed a while ago, then you shouldn’t be asked over and over again.
This type of nagging only shows that your partner doesn’t care how you feel, and he/she doesn’t have any issue putting their se*ual desires over your comfort.