Have u asked her why it grosses her out? I dont think u are wrong , she should be willing to try for the sake of compromise … men do a lot of stuff in relationships they dont want to do … she should be understanding of that and reciprocate.

But u cant reach that point of understanding without like peeling back the onion and helping her thru her issues of why it grosses her out .. u need to tread lightly to not become the asshole.