I have a
Wax Plant (Hoya cumingiana) that I got as a single stem cutting in 2008. My plant almost totally died in a winter freeze one year but I managed to save cuttings to root for a new plant. Although cumingiana blooms are pretty, there is no detectable fragrance. I took this bloom photo in May, the flowers were covered in dog fur from our 2 golden retrievers who like to walk around on the pool deck where all of my plants reside.
I also used to grow the plant formerly classified as Stephanotis floribunda but now named
Stephanotis (Marsdenia floribunda) years ago and the blooms of that one were very fragrant!