Most Helpful Guy
Sure. It happens all the time. Initially you both would test the water and get used to the new dynamic of the physical relationship and either go back if it doesn't work or evolve from there. It's actually the best way to build a stable long term relationship because you know the person and then ease the physical element into it instead of being physical from the word go in normal circumstances and having to adapt under pressure.
Most Helpful Girl
I say yes. Me and my boyfriend were best friends before going out.