Holding hands or standing near each other, light touches are fine. Anything more involved than that and it's like you're trying to show off to the world. Yes, it's great you're in love, now keep it to appropriate times and places.
I was at the mall recently and walking behind two women who were holding hands. They looked so nervous to be doing it. I felt bad for them and hope they didn't encounter any problems. It's awful to think some people would have made an issue of it just due to their gender.