No, nobody hits on her. A few years ago, about 7 or 8, some people would try. My appearance was quite a bit different then, and I could usually intimidate most other people. I am 5'10, and at that point I was about 210lbs with 8% body fat. So, I was pretty big. I also had a shaved head and a beard (my attempt to feel like a man). Now they do not hit on her because she has gained some weight ( I will leave it at that). However, I think it would be hard for me to have people constantly hitting on her. Especially since she doesn't wear her ring. If it comes to that, and you feel wary because so many people hit on her and she isn't wearing a ring you need to tell her. She is very lucky to have you. I probably will not have a wife when I start to look feminine. I am pretty certain about that now. We have been to a few couples therapy sessions, and it hasn't really helped. And last night I was talking about some of the lovely women I have met here, and she asked me do I mean women or "male to female transsexuals". I told her that MTFs are women, and she just sort of scoffed.
Sorry, got a little off topic. Back to the main point. Nikki is extremely lucky to have you. You are a rare find and she needs to respect that. If you are feeling extremely uncomfortable because she is not wearing her wedding ring, let her know. Let her know how important it is to you and why.
I really hope you two can work through this. I am sorry you are feeling so much pain.