I've told on a couple of other thread how I met my current wife.
After our first "meet for drinks" we walked around campus the long, long way back to our cars. Just before we parted, a feeling came over me that if she wasn't 6" taller than I, and if I wasn't already in a relationship, then she could be the one for me.
The idea that now is a good time for a kiss entered my mind. Had we not been "totally plutonic" and had there not been the issue of geometry, I would probably would have made a move. Instead, I suppressed everything and believe that I showed no outward sign of wanting her.
Comparing notes later, she said that at that moment she realized that a kiss was in order, and wondered how she should/would react if I tried to give her one. She was relieved that I didn't, especially since she'd resolved to not get involved with someone who was not significantly taller than herself.
Understand that the idea of kissing wasn't one of lust or sex. Neither of us wanted or intended to get sexually intimate. The connection of the moment was a much deeper thing.
It took a few months before the affair between us started. By then we knew how well matched our inward selves were -- matched well enough to eventually get married in spite of the geometry and bedroom differences.