My physical attraction to the gender /genders I like tells me if they’re potential romantic partners. I dated my best male friend, but I was secretly having a crush on him from start, I just pushed it aside because I never thought our feelings were mutual.
My current partner I’ve been with for several years now, I knew I saw something more in him the second my eyes catched his smile, I then felt it in my body reaction everytime we saw eachother amongst mutual friends. I wanted to be physically near him as much as possible and was obsessed and still is obsessed with his scent. That never happens with someone I’m only seeing as a friend.
For example I had a male friend who looked very good and everything but his scent was not attracting at all for some reason.