Indeed, it does, it feels still a bit strange for the first, let's say, 15 times, but it comes naturally by itself. I don't really know why, but this is like an 'I will' for me. Definite commitment, baring my feelings to the utmost level and making a promise, I feel I will always keep. There is nothing more I can give than an 'I love you' and voicing it, is the last step I do, before I am sure of my 'together forever happy ending' with this person. I know, really strange, but that's how my mind works in this case.
Facts: 30, female, bi, v-type relationship with Sward (husband, straight, mono) and Lin (boyfriend, straight, mono), poly-fi and co-primary.