To feel physically comfortable with someone else's body is not a decision you make. It has very little thing to do with how two people think or act or talk or even look. The mysterious magnet is either there, buried somewhere deep behind the sternum, or it is not.
Elizabeth Gilbert (2010). “The Complete Elizabeth Gilbert: Eat, Pray, Love; Committed; The Last American Man; Stern Men & Pilgrims”, p.277, A&C Black